Read/convert an InputStream to a String

本文提供了一个简单的方法来将InputStream转换为String。通过使用FileInputStream读取文件,并借助StringWriter与IOUtils.copy方法完成转换。

stackoverflow网站上的一个问题。

怎样用最简单的方法将inputstream转化为string类型?

比较好的答案:

public class InputStreamToString {
	public static void main(String[] args) {
		FileInputStream inputStream = null;
		StringWriter writer = null;
		try {
			inputStream = new FileInputStream(new File("C:\\Users\\Administrator\\Desktop\\cid.txt"));
			writer = new StringWriter();
			IOUtils.copy(inputStream, writer);
			String string = writer.toString();
			System.out.println(string);
		} catch (FileNotFoundException e1) {
			e1.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}finally {
			try {
				inputStream.close();
				writer.close();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			
		}
	}

}



package com.luxsan.service; import com.fasterxml.jackson.databind.JsonNode; import com.fasterxml.jackson.databind.ObjectMapper; import com.hankcs.hanlp.HanLP; import com.hankcs.hanlp.seg.common.Term; import com.luxsan.common.core.utils.MessageUtils; import com.luxsan.domain.ValidationResult; import jakarta.annotation.PostConstruct; import lombok.RequiredArgsConstructor; import net.sourceforge.tess4j.Tesseract; import org.apache.pdfbox.pdmodel.PDDocument; import org.apache.pdfbox.text.PDFTextStripper; import org.springframework.stereotype.Service; import org.springframework.web.multipart.MultipartFile; import javax.imageio.ImageIO; import java.awt.image.BufferedImage; import java.io.File; import java.io.InputStream; import java.nio.file.Files; import java.nio.file.Path; import java.nio.file.StandardCopyOption; import java.util.*; import java.util.regex.Pattern; @RequiredArgsConstructor @Service public class ReadFileContentService { private final ObjectMapper objectMapper = new ObjectMapper(); private Tesseract tesseract; @PostConstruct public void initOcrEngine() { tesseract = new Tesseract(); //语言包路径和支持语言 tesseract.setDatapath("D:\\maven_use\\lingxi-lhc\\lingxi-ai-extend\\lingxi-ai-comparison\\src\\main\\resources\\tessdata"); tesseract.setLanguage("eng+chi_sim"); tesseract.setPageSegMode(6); // 自动页面分割 tesseract.setOcrEngineMode(1); // LSTM引擎 } /** * 支持PDF读取文件和图片ocr */ public String extractContent(MultipartFile file) { String contentType = file.getContentType(); String fileName = file.getOriginalFilename().toLowerCase(); if (contentType == null) { return "不支持的文件类型: " + contentType; } if (fileName.endsWith(".pdf")) { return readPdfText(file); } return extractImageText(file); } /** * 读取PDF文本内容 * * @param file * @return */ public String readPdfText(MultipartFile file) { try (PDDocument doc = PDDocument.load(file.getInputStream())) { PDFTextStripper stripper = new PDFTextStripper(); // 设置行分隔符 stripper.setLineSeparator("\n"); // 设置字符间距 stripper.setSortByPosition(true); String rawText = stripper.getText(doc); System.out.println("pdf内容" + rawText); return rawText.trim(); } catch (Exception e) { return MessageUtils.message("file.read.pdf.error"); } } /** * OCR识别图片内容 */ private String extractImageText(MultipartFile file) { try (InputStream is = file.getInputStream()) { // 将输入流直接转为BufferedImage BufferedImage image = ImageIO.read(is); if (image == null) { return MessageUtils.message("Image.parsing.failed"); } // 直接对BufferedImage进行OCR String result = tesseract.doOCR(image).replaceAll("\\s+", " ").trim(); System.out.println("图片内容" + result); return result; } catch (Exception e) { return MessageUtils.message("file.read.picture.error"); } } /** * 解析json */ public JsonNode parseJson(String jsonContent) throws Exception { return this.objectMapper.readTree(jsonContent); } public List<ValidationResult> compareContent(String pdfText, JsonNode jsonConfig) { List<ValidationResult> results = new ArrayList<>(); // 统一转换为小写 String cleanPdf = pdfText.replaceAll("\\s+", "").toLowerCase(); //处理JSON结构对象/数组 JsonNode dataNode = jsonConfig.isArray() && jsonConfig.size() > 0 ? jsonConfig.get(0) : jsonConfig; // 高效遍历JSON字段 dataNode.fields().forEachRemaining(entry -> { String key = entry.getKey(); String value = entry.getValue().asText().replaceAll("\\s+", "").toLowerCase(); if (!value.isEmpty()) { boolean found = cleanPdf.contains(value); results.add(new ValidationResult( "FIELD", key, value, found ? "Found" : "Not Found", found )); } }); return results; } public JsonNode parsePipeSeparatedDataToJson(String inputData) throws Exception { Map<String, String> dataMap = parsePipeSeparatedData(inputData); return objectMapper.valueToTree(dataMap); } //解析分隔数据 public Map<String, String> parsePipeSeparatedData(String fileCONTENT) { //处理转义的换行符 fileCONTENT = fileCONTENT.replace("\\n", "\n").replaceAll("\\|+\"$", "").trim(); Map<String, String> dataMap = new LinkedHashMap<>(); String[] lines = fileCONTENT.split("\n"); if (lines.length >= 2) { String[] headers = lines[0].split("\\|"); String[] values = lines[1].split("\\|"); int minLength = Math.min(headers.length, values.length); for (int i = 0; i < minLength; i++) { dataMap.put(headers[i], values[i]); } } return dataMap; } //判断是不是json public boolean isPipeSeparatedData(String inputData) { return inputData.contains("|"); } // 比较和校验数据 public List<ValidationResult> compareAndValidate(String fileContent, JsonNode jsonConfig) { List<ValidationResult> results = new ArrayList<>(); Map<String, String> pipeDataMap = objectMapper.convertValue(jsonConfig, Map.class); // 统一转换为小写 fileContent = fileContent.replaceAll("\\s+", "").toLowerCase(); for (Map.Entry<String, String> entry : pipeDataMap.entrySet()) { String key = entry.getKey(); String value = entry.getValue(); if (!value.isEmpty()) { value = value.replaceAll("\\s+", "").toLowerCase(); boolean found = fileContent.contains(value); results.add(new ValidationResult( "FIELD", key, value, found ? "Found" : "Not Found", found )); } } return results; } } 有发送了几个请求, 回馈信息不准确。已经存在的, 也会报错不存在。 我的后端"filE_CONTENT": "PALLET_ID|KNBOXNO|CARRIER|COC|CTRY|HAWB|PO|ORIGIN|INVOICENO|CARTONS|SHIPID|SHIP_DATE|TEL|SSCC|RETURN_TO1|RETURN_TO2|RETURN_TO3|RETURN_TO4|RETURN_TO5|RETURN_TO6|RETURN_TO7|RETURN_TO8|SHIP_TO1|SHIP_TO2|SHIP_TO3|SHIP_TO4|SHIP_TO5|SHIP_TO6|SHIP_TO7|SHIP_TO8|LINEITEM1|MPN1|QTY1|LINEITEM2|MPN2|QTY2|LINEITEM3|MPN3|QTY3|\nFO2501000233P0002||DGF-AD|NL|NL|8VG8286|0638138589|PVG|8VG8286|61/84|73292885370002|06/01/2025|00000000|001959499064098506|ADI EMEIA Logistics|Inbound Department|||||||PEGATRON CORPORATION|c/o DP World Logistics Netherlands BV|Van Hilststraat 23|5145 RK Waalwijk,Netherlands|5145 RK Waalwijk Netherlands||||00010|MLPF3AA/A|10|" 拿这个值跟我的文件内容或者图片内容比较 也没有问题啊 用json也没问题 为什么前段测试 会有问题
最新发布
07-18
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