JSP常见问题汇总---持续更新

1、关于页面传递中文报错和乱码问题

前端页面通过转码：encodeURI(encodeURI(hdTestData));

后端serlet接收处理：URLDecoder.decode(request.getParameter("InterfaceBtnName"), "UTF-8");

2、引用jar问题

把要在引用的jar放在项目WEB-INFx下的lib里面，选择上jar包右键点击Build Pathj即可，路径如下：

3、关于文件下载支持中文名称问题

protected void doGet(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {
  try {
   String filePath = request.getParameter("filePath");   
   String interfaceBtnName =                 
                   URLDecoder.decode(request.getParameter("InterfaceBtnName"), "UTF-8");
   String filename = interfaceBtnName + "测试报告"; 
   
   // 文件唯一名称
   String fileOnlyName = filename + ".doc";
      //解决中文乱码
   String downWordFileName=URLDecoder.decode(fileOnlyName, "UTF-8");
   String downWordFilePath=filePath + fileOnlyName;   
   System.out.println("下载报告文件名称:"+downWordFileName);            
   
   
   // 2.1 找到文件服务器路径
   ServletContext servletContext = this.getServletContext();
   // imgs文件夹是在web目录下创建的
   // String realPath = servletContext.getRealPath(mJsonFileDir);
   // 2.2用字节流关联
   FileInputStream fileInputStream = new FileInputStream(downWordFilePath);
   // 3.1 设置响应头类型，content-type
   String mimeType = servletContext.getMimeType(downWordFileName);
   response.setHeader("content-type", mimeType);
   //设置context-disposition响应头，控制浏览器以下载形式打开，这里注意文件字符集编码 
            格式，设置utf-8，不然会出现乱码
   response.setHeader("content- 
             disposition","attachment;filename="+URLEncoder.encode(downWordFileName,"UTF-8"));
   // 4、将输入流的数据写出到输出流中
   ServletOutputStream outputStream = response.getOutputStream();
   byte[] buff = new byte[1024 * 8];
   int len = 0;
   while ((len = fileInputStream.read(buff)) != -1) {
    outputStream.write(buff, 0, len);
   }
   // 关闭输入流
   fileInputStream.close();
  } catch (UnsupportedEncodingException e) {
   e.printStackTrace();
  }
 }