javax.imageio.ImageIO.read(new URL(str_uri))出错, 参考

最新推荐文章于 2023-04-15 16:07:46 发布
原创 最新推荐文章于 2023-04-15 16:07:46 发布 · 2.3k 阅读 · 0 ·
CC 4.0 BY-SA版权
版权声明：本文为博主原创文章，遵循 CC 4.0 BY-SA 版权协议，转载请附上原文出处链接和本声明。
文章标签：

#url #file

本文讨论了使用javax.imageio.ImageIO.read方法从URL读取图片时可能遇到的问题，特别是当URL构建不正确时导致的错误。文章提供了一些个人见解和建议，帮助读者检查并修正URL构建中的常见错误。
http://topic.youkuaiyun.com/t/20060709/22/4869573.html#r_achor

老帖不能回答,
2007年之前的帖子暂时不开放该功能!

问题
javax.imageio.ImageIO.read(unknown   source)


请后来人检查自己的url构建是否错误,



即 javax.imageio.ImageIO.read(new   URL(str_uri))出错

比如str 中是否有file:/等内容

个人见解仅供参考
robinc2009
关注
ImageIO类的使用
2301_78137387的博客
12-21 921
1.ImageIO可以从本地文件中读取图片和写入图片，也可以从网络上读取图片写入本地文件中。3. 使用ImageIO读取图片实例。2.演示ImageIO读取URL资源。1.从本地文本读取图片。2.从网络上获取图片。
ImageIo.read读取图片有一层红色
兴国-为梦想而战
11-10 3315
使用BufferedImage headBuff = ImageIO.read(url);读取图片，读取后再重写有可能有一层红色。这就是ImageIO.read()方法读取图片时不能正确处理ICC信息的问题。 网上很多文章给出以下解决方案。 Image src = Toolkit.getDefaultToolkit().getImage(url); BufferedImage originalIm...
javax.imageio.ImageIO.read(unknown   source)
weixin_34218890的博客
03-12 681
http://topic.csdn.net/t/20060709/22/4869573.html#r_achor 老帖不能回答, 2007年之前的帖子暂时不开放该功能! 问题 javax.p_w_picpathio.ImageIO.read(unknown source) 请后来人检查自己的url构建是否错误, 即 javax.p_w_picp...
JAVA图片处理ImageIo.read(URL)返回Null
weixin_44798288的博客
12-07 3031
ImageIo.read(url)返回Null
java图像url无效_由于连接超时，无法通过ImageIO.read（url）获取图像
weixin_29716207的博客
02-26 1005
线程“main”中的异常javax.imageio.IIOException：无法从URL获取输入流！在jesax.imageio.ImageIO.read(ImageIO.java:1385)at maestro.Main2.main(Main2.java:25)引起：java.net.ConnectException：连接超时于java.net.PlainSocketImpl.socketCo...
Java图片读取ImageIO.read()报错
看一点点书，懂一点点道理，过好这一生
04-15 2469
Java图片读取ImageIO.read()报错
JAVA ImageIO.read方法报错/无效解决方法
Charlesix59的博客
07-14 9093
最近开始学习JAVA，使用到javax.imageio包里的read方法，不论我怎么写，IDEA一直报错。 如图： 其实这个问题很容易解决，但是JAVA初学者往往不能理解——只需要用try/catch吧需要处理的代码包围就可以了。 try { BufferedImage bi = ImageIO.read(file); } catch (IOException e) { e.printStackTrace(); } 但是
2025-10-14 16:05:36,105 ERROR n.s.t.Tesseract: I/O error reading PNG header! javax.imageio.IIOException: I/O error reading PNG header! 又出现了这个问题
最新发布
10-15
BufferedImage image = ImageIO.read(new File("path/to/image.png")); if (image == null) { throw new RuntimeException("无法读取图片"); } String result = tesseract.doOCR(image); ``` 5. **检查文件...
[Java参考文档].JDK_API 1.6
09-21
javax.xml.transform.stream 此包实现特定于流和 URI 的转换 API。 javax.xml.validation 此包提供了用于 XML 文档验证的 API。 javax.xml.ws 此包包含核心 JAX-WS API。 javax.xml.ws.handler 该包定义用于消息处理...
java.lang.IllegalArgumentException: url values must be not be absolute.
11-04
java.lang.IllegalArgumentException: URI is not absolute是Java中...因此，如果你在使用javax.imageio.ImageIO.read方法时遇到了这两个异常，你需要检查传递给这个方法的URI是否是绝对URI，以及输入参数是否为null。
JAVA_API1.6文档（中文）
04-12
javax.xml.transform.stream 此包实现特定于流和 URI 的转换 API。 javax.xml.validation 此包提供了用于 XML 文档验证的 API。 javax.xml.ws 此包包含核心 JAX-WS API。 javax.xml.ws.handler 该包定义用于消息...
package cn.lk.ehs.module.equipment.service.impl; import cn.lk.ehs.framework.common.pojo.CommonResult; import cn.lk.ehs.framework.mongodb.base.service.impl.LKServiceImpl; import cn.lk.ehs.module.equipment.entity.Record; import cn.lk.ehs.module.equipment.entity.*; import cn.lk.ehs.module.equipment.mapper.FixMapper; import cn.lk.ehs.module.equipment.service.*; import cn.lk.ehs.module.equipment.utils.TaxUtil; import lombok.extern.slf4j.Slf4j; import org.apache.poi.util.Units; import org.apache.poi.wp.usermodel.HeaderFooterType; import org.apache.poi.xwpf.usermodel.*; import org.openxmlformats.schemas.wordprocessingml.x2006.main.*; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.beans.factory.annotation.Value; import org.springframework.data.mongodb.core.query.Criteria; import org.springframework.data.mongodb.core.query.Query; import org.springframework.stereotype.Service; import javax.imageio.IIOImage; import javax.imageio.ImageIO; import javax.imageio.ImageWriteParam; import javax.imageio.ImageWriter; import javax.imageio.stream.ImageOutputStream; import java.awt.*; import java.awt.image.BufferedImage; import java.io.*; import java.math.BigDecimal; import java.math.BigInteger; import java.net.URL; import java.net.URLConnection; import java.text.DecimalFormat; import java.util.ArrayList; import java.util.List; import java.util.Objects; import java.util.stream.Collectors; import static cn.lk.ehs.framework.common.pojo.CommonResult.error; import static cn.lk.ehs.framework.common.pojo.CommonResult.success; @Slf4j @Service public class FixDetailServiceImpl extends LKServiceImpl<FixMapper, FixDetail, String> implements FixDetailService { @Autowired private EquipmentService equipmentService; @Autowired private EntityService entityService; @Autowired private ConstructService constructService; @Autowired private ShareService shareService; @Autowired private cn.lk.ehs.module.equipment.service.LedgerService ledgerService; @Autowired private RecordService recordService; @Autowired private PartService partService; @Value("${file.upload.base-path}") private String basePath; private static final int BATCH_SIZE = 100; // 分批处理大小 private static final int PAGE_SIZE_LIMIT = 4; // 每页最大行数 private static final int MAX_IMAGE_SIZE_KB = 100; // 目标图片大小 @Override public CommonResult addFixDetail(FixDetail itemData) { //验证项目是否可以转固 Query query = Query.query(Criteria.where("itemNum").is(itemData.getItemNum())); query.addCriteria(Criteria.where("deleted").is(0)); List<EquipmentData> equipmentData = equipmentService.list(query); if (!equipmentData.isEmpty()) { if (!"1".equals(equipmentData.get(0).getIsAccept())) { return error(1, "项目未完成验收无法转固！"); } //查数据补入台账表 List<EntityItem> entityItems = entityService.getlist(query, itemData.getItemNum()); List<Construct> constructs = constructService.list(query); //做一个台账对象插入数据库 更改项目表状态 List<Ledger> ledgers = packageLedger(entityItems, equipmentData, constructs); ledgerService.saveBatch(ledgers); EquipmentData e = equipmentData.get(0); e.setFixedDate(itemData.getDate()); e.setIsFixed("1"); e.setStatus(6); e.setItemType("5"); equipmentService.updateById(e); List<Record> records = packageRecords(itemData, e); recordService.saveBatch(records); save(itemData); } else { return error(1, "未查询到合同信息！"); } return success(itemData); } /** * 拼装档案数据 * * @param itemData * @param e * @return */ private List<Record> packageRecords(FixDetail itemData, EquipmentData e) { List<Record> records = new ArrayList<>(); for (int i = 0; i < 5; i++) { Record record = new Record(); record.setItemNum(itemData.getItemNum()); record.setItemName(e.getItemName()); record.setContractNum(e.getContractNum()); record.setSupplierName(e.getSupplierName()); record.setSupplierCode(e.getSupplierCode()); switch (i) { case 0: record.setType("5"); record.setFileUri(itemData.getCheckFixUri()); if (!itemData.getCheckFixUri().isEmpty()) { records.add(record); } break; case 1: record.setType("6"); record.setFileUri(itemData.getVerifyUri()); if (!itemData.getVerifyUri().isEmpty()) { records.add(record); } break; case 2: record.setType("7"); record.setFileUri(itemData.getPromiseUri()); if (!itemData.getPromiseUri().isEmpty()) { records.add(record); } break; case 3: record.setType("9"); record.setFileUri(itemData.getEntityUri()); if (!itemData.getEntityUri().isEmpty()) { records.add(record); } break; case 4: record.setType("10"); record.setFileUri(itemData.getDrawingUri()); if (!itemData.getDrawingUri().isEmpty()) { records.add(record); } break; default: break; } } List<FileRecords> otherUris = itemData.getOtherUri(); if (!otherUris.isEmpty()) { //先查询是否有同项目编号 项目名 合同号的数据 Query entityQuery = Query.query(Criteria.where("itemNum").is(itemData.getItemNum())); entityQuery.addCriteria(Criteria.where("itemName").is(e.getItemName())); entityQuery.addCriteria(Criteria.where("contractNum").is(e.getContractNum())); entityQuery.addCriteria(Criteria.where("type").is(0)); List<Record> existRecord = recordService.list(entityQuery); if (!existRecord.isEmpty()) { List<FileRecords> urls = existRecord.get(0).getFileUri(); urls.addAll(otherUris); records.get(0).setFileUri(urls); recordService.updateById(records.get(0)); } else { Record record = new Record(); record.setItemNum(itemData.getItemNum()); record.setItemName(e.getItemName()); record.setContractNum(e.getContractNum()); record.setType("0"); record.setFileUri(otherUris); record.setSupplierName(e.getSupplierName()); record.setSupplierCode(e.getSupplierCode()); recordService.save(record); } } return records; } private List<Ledger> packageLedger(List<EntityItem> entityItems, List<EquipmentData> equipmentData, List<Construct> constructs) { List<Ledger> ledgers = new ArrayList<>(); EquipmentData itemData = equipmentData.get(0); for (EntityItem entityItem : entityItems) { //查询toolNumber在台账表内是否存在 如果已经存在把比例改为百分之百 Query ledQuery = Query.query(Criteria.where("toolNumber").is(entityItem.getToolNumber())); ledQuery.addCriteria(Criteria.where("deleted").is(0)); List<Ledger> ledgerList = ledgerService.list(ledQuery); if (null != ledgerList && !ledgerList.isEmpty()) { Ledger ledger = ledgerList.get(0); ledger.setFinishRatio("100%"); ledgerService.updateById(ledger); continue; } Ledger ledger = new Ledger(); //，模具部分 ledger.setToolNumber(entityItem.getToolNumber()); ledger.setToolName(entityItem.getToolName()); ledger.setNameplateUri(getNameplate(entityItem.getItemNum(), entityItem.getToolNumber())); ledger.setToolUri(getToolUri(entityItem.getItemNum(), entityItem.getToolNumber())); ledger.setProductUri(getProductUri(entityItem.getItemNum(), entityItem.getToolNumber())); ledger.setNum(entityItem.getNum()); ledger.setCarModule(entityItem.getCarModule().stream().collect(Collectors.joining("/"))); ledger.setAssetType(entityItem.getAssetType()); ledger.setNewOrOld(entityItem.getNewOrOld()); ledger.setCavitiesNum(entityItem.getCavitiesNum()); ledger.setMaterial(entityItem.getMaterial()); ledger.setSize(entityItem.getSize()); ledger.setWeight(entityItem.getWeight()); ledger.setSapCode(entityItem.getSapCode()); //新增字段 //项目部分 ledger.setItemNum(itemData.getItemNum()); ledger.setItemName(itemData.getItemName()); ledger.setContractNum(itemData.getContractNum()); ledger.setSupplierCode(itemData.getSupplierCode()); ledger.setSupplierName(itemData.getSupplierName()); //零件部分。 Query query = Query.query(Criteria.where("itemNum").is(itemData.getItemNum())); query.addCriteria(Criteria.where("deleted").is(0)); query.addCriteria(Criteria.where("toolNumber").is(entityItem.getToolNumber())); //新增BUG，按单个资产查询零件。 List<PartItem> partItems = partService.list(query); //将零件编号和零件名称组合写入台账 String partCodes = partItems.stream().map(PartItem::getPartCode).collect(Collectors.joining("/")); String partNames = partItems.stream().map(PartItem::getPartName).collect(Collectors.joining("/")); ledger.setParCodes(partCodes); ledger.setParNames(partNames); ledger.setConstructList(constructs); ledger.setIsShare("0"); //判断是否包含分摊。如果包含分摊 归拢出当前模具对总价值的占比 if (null != itemData.getProjectType() && "在建".equals(itemData.getProjectType()) && null != itemData.getLinkContract() && !itemData.getLinkContract().isEmpty()) { ledger.setIsShare("1"); // ledger.setShareTax(itemData.getFixedRatio()); ledger.setFixedRatio(itemData.getFixedRatio()); ledger.setFinishRatio(TaxUtil.calculatePartyBOwnership(itemData.getFixedRatio())); } if (null != itemData.getProjectType() && "分摊".equals(itemData.getProjectType())) { ledger.setIsShare("1"); // ledger.setShareTax(itemData.getFixedRatio()); ledger.setFixedRatio(itemData.getFixedRatio()); ledger.setFinishRatio(itemData.getFixedRatio() + "%"); } ledger.setSecondary("0"); //资产 ledger.setAssetsSubord(entityItem.getSapCode() + "0"); //资产加次级 ledger.setEntityDesc(entityItem.getToolName()); //资产描述 ledger.setCapitalizationDate(""); ledger.setPurchasePrice(entityItem.getTaxMoney()); ledger.setImpairmentAmount(""); ledger.setBookValue(""); ledger.setCurrency(""); ledger.setCostCenter(""); ledger.setAssetClass(""); ledger.setSubject(""); ledger.setStockCode(entityItem.getToolNumber()); //存货号 ledger.setStatus("1"); //资产状态 ledger.setCategory(parseCatgory(entityItem.getNewOrOld())); //资产类别 if (itemData.getSupplierName().equals(entityItem.getLocation())) { ledger.setPrimaryLocation(itemData.getSupplierName()); //一级存放地点 ledger.setSecondaryLocation(""); //二级存放地点 } else { ledger.setPrimaryLocation(itemData.getSupplierName()); //一级存放地点 ledger.setSecondaryLocation(entityItem.getLocation()); //二级存放地点 } ledger.setLife(entityItem.getModelLife()); //设计寿命 ledgers.add(ledger); } return ledgers; } private String parseCatgory(Object cellValue) { //对象属性转CellData if (cellValue == null) { return ""; } if (cellValue.equals("新制")) { return "1"; } else if (cellValue.equals("改制")) { return "2"; } return "1"; } private List<String> getToolUri(String ItemNum, String toolNumber) { Query entityQuery = Query.query(Criteria.where("itemNum").is(ItemNum)); entityQuery.addCriteria(Criteria.where("deleted").is(0)); entityQuery.addCriteria(Criteria.where("toolNumber").is(toolNumber)); List<EntityItem> entityItems = entityService.list(entityQuery); for (EntityItem fixTool : entityItems) { if (toolNumber.equals(fixTool.getToolNumber())) { List<FileRecords> files = fixTool.getPropertyUri(); if (files.size() > 0) { return files.stream().map(FileRecords::getFileUri).collect(Collectors.toList()); } } } return new ArrayList<String>(); } private List<String> getProductUri(String ItemNum, String toolNumber) { Query entityQuery = Query.query(Criteria.where("itemNum").is(ItemNum)); entityQuery.addCriteria(Criteria.where("deleted").is(0)); entityQuery.addCriteria(Criteria.where("toolNumber").is(toolNumber)); List<EntityItem> entityItems = entityService.list(entityQuery); for (EntityItem fixTool : entityItems) { if (toolNumber.equals(fixTool.getToolNumber())) { List<FileRecords> files = fixTool.getProductUri(); if (files.size() > 0) { return files.stream().map(FileRecords::getFileUri).collect(Collectors.toList()); } } } return new ArrayList<String>(); } private String getNameplate(String ItemNum, String toolNumber) { Query entityQuery = Query.query(Criteria.where("itemNum").is(ItemNum)); entityQuery.addCriteria(Criteria.where("deleted").is(0)); entityQuery.addCriteria(Criteria.where("toolNumber").is(toolNumber)); List<EntityItem> entityItems = entityService.list(entityQuery); for (EntityItem fixTool : entityItems) { if (toolNumber.equals(fixTool.getToolNumber())) { List<FileRecords> files = fixTool.getNameplateUri(); if (files.size() > 0) { return files.get(0).getFileUri(); } } } return ""; } /** * 获取当前模具下零件的付款总额 * * @return */ private String getPartTax(List<PartItem> partItems, EquipmentData itemData, List<Construct> constructs) { partItems = packagePart(partItems); BigDecimal total = new BigDecimal("0.00"); for (PartItem item : partItems) { if (item.getAlreadyNum().isBlank() || item.getPrice().isBlank()) { continue; } BigDecimal alreadyNum = new BigDecimal(item.getAlreadyNum().trim()); BigDecimal price = new BigDecimal(item.getPrice().trim()); BigDecimal partSum = alreadyNum.multiply(price); total = total.add(partSum); } Query query = Query.query(Criteria.where("itemNum").is(itemData.getItemNum())); query.addCriteria(Criteria.where("deleted").is(0)); BigDecimal constructTotal = new BigDecimal("0.00"); for (Construct item : constructs) { BigDecimal part = new BigDecimal(item.getPayNum().trim()); constructTotal = constructTotal.add(part); } BigDecimal amount = new BigDecimal(itemData.getAmount()); // 格式化为两位小数 DecimalFormat df = new DecimalFormat("0.00"); return TaxUtil.calculatePercentage(amount.subtract(constructTotal).toString(), df.format(total)); } /** * 拼装已收货数量为了后边算总价做准备 * * @param partItems * @return */ private List<PartItem> packagePart(List<PartItem> partItems) { if (partItems.isEmpty()) { return partItems; } for (PartItem partItem : partItems) { //循环零件表数据 去到货表内拿子数据 Query query = Query.query(Criteria.where("partId").is(partItem.getId())); query.addCriteria(Criteria.where("deleted").is(0)); query.addCriteria(Criteria.where("partCode").is(partItem.getPartCode())); List<ShareItem> list = shareService.list(query); int sum = list.stream() .filter(Objects::nonNull) // 过滤 null 值 .mapToInt(ShareItem::getNum) .sum(); partItem.setAlreadyNum(String.valueOf(sum)); } return partItems; } @Override public CommonResult uptFixDetail(FixDetail itemData) { //验证项目是否可以转固 Query query = Query.query(Criteria.where("itemNum").is(itemData.getItemNum())); query.addCriteria(Criteria.where("deleted").is(0)); query.addCriteria(Criteria.where("status").is(5)); List<EquipmentData> finance = equipmentService.list(query); if (!finance.isEmpty()) { itemData.setFinanceStatus(0); updateById(itemData); } else { return error(1, "项目未处于待转固状态！"); } return success(itemData); } @Override public ByteArrayOutputStream exportToWord(List<EntityItem> entityItems) throws Exception { return exportToWordStream(entityItems); } public ByteArrayOutputStream exportToWordStream(List<EntityItem> records) throws Exception { // 创建临时文件作为缓冲区 File tempFile = File.createTempFile("word_export", ".docx"); try (FileOutputStream fos = new FileOutputStream(tempFile); XWPFDocument doc = new XWPFDocument()) { // 设置页面布局 setupPageLayout(doc); // 初始化表格和计数器 XWPFTable currentTable = createNewTable(doc); int currentPageRowCount = 1; int num = 0; // 处理所有记录 for (int i = 0; i < records.size(); i++) { EntityItem record = records.get(i); // 分批处理：定期写入磁盘释放内存 if (i > 0 && i % BATCH_SIZE == 0) { doc.write(fos); fos.flush(); doc.removeBodyElement(doc.getPosOfTable(currentTable)); currentTable = createNewTable(doc); } // 计算图片行数 int maxImageRows = calculateMaxImageRows( record.getPropertyUri(), record.getNameplateUri(), record.getProductUri() ); // 分页检查 if (currentPageRowCount + maxImageRows > PAGE_SIZE_LIMIT) { doc.createParagraph().setPageBreak(true); currentTable = createNewTable(doc); currentPageRowCount = 1; } // 创建数据行 XWPFTableRow row = currentTable.createRow(); row.setCantSplitRow(true); // 文本列 createFixedWidthTextCell(row, 0, String.valueOf(++num), 800); createFixedWidthTextCell(row, 1, record.getToolNumber(), 1000); createFixedWidthTextCell(row, 2, record.getToolName(), 1000); // 图片列（使用流式处理） addImagesToCellWithStream(row.getCell(3), record.getPropertyUri(), 6800, 2, 1); addImagesToCellWithStream(row.getCell(4), record.getNameplateUri(), 3000, 1, 2); addImagesToCellWithStream(row.getCell(5), record.getProductUri(), 3000, 2, 3); currentPageRowCount += maxImageRows; } // 添加页码并写入最终内容 addPageNumbers(doc); doc.write(fos); // 从临时文件读取到字节流 return readTempFileToOutputStream(tempFile); } finally { // 确保删除临时文件 if (tempFile.exists()) { tempFile.delete(); } } } // 读取临时文件到字节流 private ByteArrayOutputStream readTempFileToOutputStream(File tempFile) throws IOException { try (ByteArrayOutputStream outputStream = new ByteArrayOutputStream(); FileInputStream fis = new FileInputStream(tempFile)) { byte[] buffer = new byte[1024]; int len; while ((len = fis.read(buffer)) > 0) { outputStream.write(buffer, 0, len); } return outputStream; } } // 统一表格创建方法 private XWPFTable createNewTable(XWPFDocument doc) { XWPFTable table = doc.createTable(); setupTable(table); createTableHeader(table); return table; } // 优化图片行数计算 private int calculateMaxImageRows(List<FileRecords>... imageLists) { int maxRows = 0; for (List<FileRecords> list : imageLists) { if (list != null && !list.isEmpty()) { int itemCount = list.size(); int cols = (list == imageLists[2]) ? 4 : 2; // 产品图4列，其它2列 int rows = (int) Math.ceil((double) itemCount / cols); maxRows = Math.max(maxRows, rows); } } return maxRows > 0 ? maxRows : 1; // 至少1行 } // 页面设置 private static void setupPageLayout(XWPFDocument doc) { CTSectPr sectPr = doc.getDocument().getBody().addNewSectPr(); CTPageSz pageSize = sectPr.addNewPgSz(); pageSize.setOrient(STPageOrientation.LANDSCAPE); pageSize.setW(BigInteger.valueOf(16840)); pageSize.setH(BigInteger.valueOf(11900)); CTPageMar pageMar = sectPr.addNewPgMar(); pageMar.setLeft(BigInteger.valueOf(390)); pageMar.setRight(BigInteger.valueOf(390)); pageMar.setTop(BigInteger.valueOf(900)); pageMar.setBottom(BigInteger.valueOf(900)); pageMar.setFooter(BigInteger.valueOf(900)); } // 表格设置 private static void setupTable(XWPFTable table) { table.setWidth("100%"); int[] columnWidths = {500, 500, 500, 5000, 2000, 5000}; CTTbl cttbl = table.getCTTbl(); CTTblGrid tblGrid = cttbl.getTblGrid() != null ? cttbl.getTblGrid() : cttbl.addNewTblGrid(); // 清空现有网格列 if (tblGrid.sizeOfGridColArray() > 0) { tblGrid.removeGridCol(0); } // 添加新网格列 for (int width : columnWidths) { CTTblGridCol gridCol = tblGrid.addNewGridCol(); gridCol.setW(BigInteger.valueOf(width)); } } // 创建表头 private static void createTableHeader(XWPFTable table) { XWPFTableRow headerRow = table.getRow(0); for (int i = 0; i < 6; i++) { XWPFTableCell cell = headerRow.getCell(i) != null ? headerRow.getCell(i) : headerRow.createCell(); // 清除现有内容 for (int j = cell.getParagraphs().size() - 1; j >= 0; j--) { cell.removeParagraph(j); } // 添加新内容 XWPFParagraph para = cell.addParagraph(); para.setAlignment(ParagraphAlignment.CENTER); XWPFRun run = para.createRun(); run.setBold(true); run.setFontSize(12); run.setText(getHeaderText(i)); } } // 固定宽度文本单元格 private void createFixedWidthTextCell(XWPFTableRow row, int pos, String text, int width) { XWPFTableCell cell = row.getCell(pos) != null ? row.getCell(pos) : row.createCell(); // 清除现有内容 for (int i = cell.getParagraphs().size() - 1; i >= 0; i--) { cell.removeParagraph(i); } // 设置固定宽度 CTTcPr tcPr = cell.getCTTc().getTcPr(); if (tcPr == null) tcPr = cell.getCTTc().addNewTcPr(); tcPr.addNewTcW().setW(BigInteger.valueOf(width)); // 添加内容 XWPFParagraph para = cell.addParagraph(); para.setAlignment(ParagraphAlignment.CENTER); para.setWordWrap(true); XWPFRun run = para.createRun(); run.setText(text); } // 图片流获取方法 private InputStream getImageStream(String uri) throws IOException { URL url = new URL(uri); URLConnection conn = url.openConnection(); conn.setConnectTimeout(5000); conn.setReadTimeout(10000); return conn.getInputStream(); } // 图片尺寸计算 private int[] calculateImageDimensions(int flags) { switch (flags) { case 1: return new int[]{135, 120}; // 属性图 case 2: return new int[]{245, 120}; // 铭牌 case 3: return new int[]{60, 60}; // 产品图 default: return new int[]{120, 120};// 默认 } } // 表头文本 private static String getHeaderText(int colIndex) { String[] headers = {"序号", "工装编号", "资产名称", "关联图片", "铭牌", "产品图片"}; return colIndex < headers.length ? headers[colIndex] : ""; } // 添加页码 private static void addPageNumbers(XWPFDocument doc) { XWPFFooter footer = doc.createFooter(HeaderFooterType.DEFAULT); XWPFParagraph para = footer.createParagraph(); para.setAlignment(ParagraphAlignment.CENTER); XWPFRun run = para.createRun(); run.getCTR().addNewFldChar().setFldCharType(STFldCharType.BEGIN); run.getCTR().addNewInstrText().setStringValue("PAGE"); run.getCTR().addNewFldChar().setFldCharType(STFldCharType.END); run.setText(" / "); run.getCTR().addNewFldChar().setFldCharType(STFldCharType.BEGIN); run.getCTR().addNewInstrText().setStringValue("NUMPAGES"); run.getCTR().addNewFldChar().setFldCharType(STFldCharType.END); } // 图片类型检测 private int determineImageType(String fileName) { if (fileName == null || fileName.lastIndexOf(".") == -1) { return XWPFDocument.PICTURE_TYPE_PNG; // 默认PNG } String ext = fileName.substring(fileName.lastIndexOf(".") + 1).toLowerCase(); switch (ext) { case "png": return XWPFDocument.PICTURE_TYPE_PNG; case "jpg": case "jpeg": return XWPFDocument.PICTURE_TYPE_JPEG; case "gif": return XWPFDocument.PICTURE_TYPE_GIF; case "bmp": return XWPFDocument.PICTURE_TYPE_BMP; default: return XWPFDocument.PICTURE_TYPE_PNG; } } // 修改图片处理方法 private void addImagesToCellWithStream(XWPFTableCell cell, List<FileRecords> imagePaths, int cellWidth, int colsPerRow, int flags) { if (cell == null || imagePaths == null || imagePaths.isEmpty()) return; // 清除单元格现有内容 for (int i = cell.getParagraphs().size() - 1; i >= 0; i--) { cell.removeParagraph(i); } // 设置单元格宽度 CTTcPr tcPr = cell.getCTTc().getTcPr(); if (tcPr == null) tcPr = cell.getCTTc().addNewTcPr(); tcPr.addNewTcW().setW(BigInteger.valueOf(cellWidth)); XWPFParagraph currentPara = cell.addParagraph(); currentPara.setAlignment(ParagraphAlignment.LEFT); XWPFRun currentRun = currentPara.createRun(); for (int i = 0; i < imagePaths.size(); i++) { FileRecords imagePath = imagePaths.get(i); try { // 获取优化后的图片流 try (InputStream is = getOptimizedImageStream(imagePath.getFileUri(), flags)) { if (is != null) { int imageType = determineImageType(imagePath.getFileUri()); int[] dimensions = calculateImageDimensions(flags); // 添加压缩后的图片 currentRun.addPicture( is, imageType, imagePath.getFileUri(), Units.toEMU(dimensions[0]), Units.toEMU(dimensions[1]) ); } } // 换行控制 if ((i + 1) % colsPerRow == 0 && (i + 1) < imagePaths.size()) { currentPara = cell.addParagraph(); currentPara.setAlignment(ParagraphAlignment.LEFT); currentRun = currentPara.createRun(); } } catch (Exception e) { currentRun.setText("[图片处理失败: " + e.getMessage() + "]"); } } } // 图片优化处理 private InputStream getOptimizedImageStream(String uri, int flags) throws IOException { URL url = new URL(uri); URLConnection conn = url.openConnection(); conn.setConnectTimeout(5000); conn.setReadTimeout(10000); try (InputStream originalStream = conn.getInputStream()) { // 获取原始图片 BufferedImage originalImage = ImageIO.read(originalStream); if (originalImage == null) return null; // 计算目标尺寸并缩放 int[] targetDimensions = calculateTargetDimensions(originalImage, flags); BufferedImage scaledImage = scaleImage(originalImage, targetDimensions[0], targetDimensions[1]); // 压缩并转换格式 return compressImage(scaledImage, MAX_IMAGE_SIZE_KB * 1024); } } // 计算优化后的尺寸 private int[] calculateTargetDimensions(BufferedImage image, int flags) { int[] displayDims = calculateImageDimensions(flags); int displayWidth = displayDims[0]; int displayHeight = displayDims[1]; // 保持原始宽高比 double aspectRatio = (double) image.getWidth() / image.getHeight(); int targetWidth = displayWidth; int targetHeight = (int) (targetWidth / aspectRatio); // 确保不小于显示尺寸 if (targetHeight < displayHeight) { targetHeight = displayHeight; targetWidth = (int) (targetHeight * aspectRatio); } // 限制最大尺寸（避免过大） int maxDimension = 1500; // 最大像素尺寸 if (targetWidth > maxDimension || targetHeight > maxDimension) { if (targetWidth > targetHeight) { targetWidth = maxDimension; targetHeight = (int) (maxDimension / aspectRatio); } else { targetHeight = maxDimension; targetWidth = (int) (maxDimension * aspectRatio); } } return new int[]{targetWidth, targetHeight}; } // 图片缩放 private BufferedImage scaleImage(BufferedImage original, int width, int height) { BufferedImage scaled = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); Graphics2D g = scaled.createGraphics(); g.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR); g.drawImage(original, 0, 0, width, height, null); g.dispose(); return scaled; } // 图片压缩 private InputStream compressImage(BufferedImage image, long maxSize) throws IOException { float quality = 0.8f; // 初始质量 ByteArrayOutputStream output = new ByteArrayOutputStream(); // 迭代压缩直到满足大小 do { output.reset(); ImageWriter writer = ImageIO.getImageWritersByFormatName("jpg").next(); ImageWriteParam param = writer.getDefaultWriteParam(); // 设置压缩参数 if (param.canWriteCompressed()) { param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT); param.setCompressionQuality(quality); } try (ImageOutputStream ios = ImageIO.createImageOutputStream(output)) { writer.setOutput(ios); writer.write(null, new IIOImage(image, null, null), param); } writer.dispose(); quality -= 0.1f; // 降低质量 } while (output.size() > maxSize && quality > 0.3f); // 转换为JPEG格式（更好的压缩率） return new ByteArrayInputStream(output.toByteArray()); } }帮忙整理下代码注释 间隔等等给一份完整代码
09-26
import javax.imageio.ImageIO; import javax.imageio.ImageWriteParam; import javax.imageio.ImageWriter; import javax.imageio.stream.ImageOutputStream; import java.awt.*; import java.awt.image....
Java图片处理ImageIO.read()问题
04-08
NULL 博文链接：https://o-oand0-0.iteye.com/blog/1585854
使用ImageIO读取网络图片（二维码）或本地图片
huanglianggu的专栏
02-04 2082
来自网络 使用ImageIO读取网络图片（二维码）或本地图片 一读取网络图片 public static String analysisReadQRCode(String path){ MultiFormatReader multiFormatReader=new MultiFormatReader(); HashMap hints=new HashMap(); hints.put(EncodeHintType.CHARACTER_SET,"G
java bufferimage bmp_java – 为什么使用ImageIO无法从URL获取BufferedImage
weixin_35615010的博客
02-23 589
URL url = new URL(imageURL);BufferedImage image = ImageIO.read(url);要么URL url = new URL(imageURL);BufferedImage image = ImageIO.read(url.openStream());结果图像是null？为什么？解决方法:ImageIO.read(URL)支持像您描述的那样从URL...
java 下载图片403_java-ImageIO.read()返回403错误
weixin_39985279的博客
02-16 431
ImageIO.read(URL)方法打开具有几乎所有默认设置的URL连接,包括User-Agent属性(将设置为您正在运行的JVM版本).显然,您列出的网站希望使用更“标准”的UA.使用直接的telnet连接进行测试：ImageIO.read(url)发送的请求：GET /newsimage/osteoderms-storing-minerals-helped-huge-dinosaurs-su...
通过ImageIO类读取照片
LS的博客
04-28 2888
这里写自定义目录标题欢迎使用Markdown编辑器新的改变功能快捷键合理的创建标题，有助于目录的生成如何改变文本的样式插入链接与图片如何插入一段漂亮的代码片生成一个适合你的列表创建一个表格设定内容居中、居左、居右SmartyPants创建一个自定义列表如何创建一个注脚注释也是必不可少的KaTeX数学公式新的甘特图功能，丰富你的文章UML 图表FLowchart流程图导出与导入导出导入 从一个路径读...
程序使用的URL出现异常,at java.net.URI.create(URI.java:842)
VB123hjp的专栏
10-12 5616
使用if("get".equals(strMethod.toLowerCase())) method = new HttpGet(uri);， 报错：Exception in thread "main" java.lang.IllegalArgumentException at java.net.URI.create(URI.java:842) at org.apache.http.client.
java读取tif时imageio.read报空指针_部分图片文件解析时（javax.imageio.ImageIO.read）出现空指针异常...
weixin_28961565的博客
03-02 2852
一、现象描述：图片通过普通看图工具打开正常显示，但是通过javax.imageio.ImageIO.read读取时出现空指针二、可能原因：一是图片路径异常，二是图片格式不符(可用ps软件验证，尝试是否能正常打开)三、解决方案： jdk本身支持一些图片的处理，如jpeg,bmp,png，但是jdk的图片编解码库不是很强，所以针对部分图片的处理会出现问题， TwelveMonkeys是一个图片编解码库...
评论
成就一亿技术人!
拼手气红包6.0元
还能输入1000个字符
 
红包 添加红包
表情包 插入表情
表情包 代码片
 条评论被折叠 查看
添加红包

请填写红包祝福语或标题

个

红包个数最小为10个

元

红包金额最低5元

当前余额3.43元 前往充值 >
需支付：10.00元
成就一亿技术人!
领取后你会自动成为博主和红包主的粉丝 规则
hope_wisdom
发出的红包
实付元
使用余额支付
点击重新获取
扫码支付
钱包余额 0

抵扣说明：

1.余额是钱包充值的虚拟货币，按照1:1的比例进行支付金额的抵扣。
2.余额无法直接购买下载，可以购买VIP、付费专栏及课程。

余额充值