上传附件【上传一个附件时】

最新推荐文章于 2021-04-04 23:42:55 发布

原创最新推荐文章于 2021-04-04 23:42:55 发布 · 237 阅读

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本文详细阐述了在Java应用中如何通过JSP页面接收文件上传，并在Action类中进行文件处理的过程。包括文件的基本配置、上传逻辑实现及上传文件到指定目录的详细步骤。同时介绍了上传文件的方法，涉及文件路径、文件名处理和错误处理机制。

其中jsp页面中只需定义type=”file“，name="proReCheckFile"

在Aciton中，需要定义

priate File proReCheckFIle;

private String proReCheckFileFileName;

jsp页面：

附件：<input type="file" name="proReCheckFile" style="width:250px;"/>

Action类：

private File proReCheckFile;
private String proReCheckFileFileName;

public File getProReCheckFile() {
       return proReCheckFile;
}
public void setProReCheckFile(File proReCheckFile) {
       this.proReCheckFile = proReCheckFile;
}
public String getProReCheckFileFileName() {
  return proReCheckFileFileName;
}
public void setProReCheckFileFileName(String proReCheckFileFileName) {
  this.proReCheckFileFileName = proReCheckFileFileName;
}

逻辑代码：

     String uuid= null;
    String proReCheckFileName = "",savedProReCheckFileName = "";
    if(proReCheckFileFileName != null && proReCheckFile!=null) {
           uuid = UUID.randomUUID().toString();
            savedProReCheckFileName = uuid + proReCheckFileFileName;
            proReCheckFileName=proReCheckFileFileName;
             //添加QA审核人以及上传前的文件名和上传后的文件名
             crObject.setProReCheckFileName(proReCheckFileName);
             crObject.setSavedproReCheckFileName(savedProReCheckFileName);
             crObject.setReChecker(reChecker);
             UploadReCheckFileName.getFileName(proReCheckFile,proReCheckFileFileName,uuid);
   }

其中 UploadReCheckFileName中的方法是：

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
public class UploadReCheckFileName {
     private final static Log log = LogFactory.getLog("UploadReCheckFileName");
     private final static String FILE_UPLOAD_DIR;
     static{
          FILE_UPLOAD_DIR = System.getProperty("BASERESOURCEPATH") + "upload/proReCheckFile/";
      }

     //获取savedProReCheckFileName)
     public static void getFileName(File attachments, String proReCheckFileName,String uuid){
                String savedProReCheckFileName = null;
                if(proReCheckFileName != null && attachments!=null) {

                               savedProReCheckFileName = uuid + proReCheckFileName;
                              if(attachments != null){
                                  uploadReCheckFile(attachments,proReCheckFileName, avedProReCheckFileName);
                               }
                     }
    }

    //TODO(上传文件)
    public static void uploadReCheckFile(File attachments,String proReCheckFileName,   String savedProReCheckFileName){
     if( proReCheckFileName == null || savedProReCheckFileName == null){
              log.error("上传文件失败,出现空指针.");
               return;
      }
       File uploadFile = new File(FILE_UPLOAD_DIR, savedProReCheckFileName);//指定要操作的文件
       InputStream is = null;
       OutputStream os = null;
      try {
                 //判断此文件上一级文件夹是否存在
                  if(!uploadFile.getParentFile().exists()){
                        uploadFile.getParentFile().mkdirs();//文件夹如果如果不存在，则自动创建多层目录
                        uploadFile.createNewFile();//创建文件
               }
             int len;
             byte[] buffer = new byte[1024];
               is = new FileInputStream(attachments);
               os = new FileOutputStream(uploadFile);
               while ((len = is.read(buffer)) != -1) {
                      os.write(buffer, 0, len);
                }
    } catch (Exception e) {
         log.error("当上传文件[proReCheckFileName: " + proReCheckFileName + "]时发生异常！", e);
         throw new RuntimeException(e);
    } finally {
        try {
              if (is != null) is.close();
             if (os != null) os.close();
         } catch (Exception e) {
             log.error("当关闭[proReCheckFileName: " + proReCheckFileName + "文件流时发生异常！", e);
              throw new RuntimeException(e);
         }
         log.info("上传完成！[proReCheckFileName: " +