老师我还是没有发现问题在哪，报错信息又添加了一行和EncodingFilter第33行有关，我就很郁闷了，而且我发现把EncodingFilter的第33行注释掉之后就浏览器就没有任何响应信息呈现一个空白页面，实在没有头绪了，请老师指点
报错信息如下：
Type 异常报告
消息 org.apache.tomcat.util.http.fileupload.impl.InvalidContentTypeException: the request doesn't contain a multipart/form-data or multipart/mixed stream, content type header is null
描述 服务器遇到一个意外的情况，阻止它完成请求。
Exception
javax.servlet.ServletException: org.apache.tomcat.util.http.fileupload.impl.InvalidContentTypeException: the request doesn't contain a multipart/form-data or multipart/mixed stream, content type header is null
org.apache.catalina.connector.Request.parseParts(Request.java:2913)
org.apache.catalina.connector.Request.getParts(Request.java:2775)
org.apache.catalina.connector.Request.getPart(Request.java:2944)
org.apache.catalina.connector.RequestFacade.getPart(RequestFacade.java:1105)
com.bjsxt.servlet.FileUpLoadServlet.doPost(FileUpLoadServlet.java:32)
com.bjsxt.servlet.FileUpLoadServlet.doGet(FileUpLoadServlet.java:20)
javax.servlet.http.HttpServlet.service(HttpServlet.java:634)
javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
com.bjsxt.filter.EncodingFilter.doFilter(EncodingFilter.java:33)
Root Cause
org.apache.tomcat.util.http.fileupload.impl.InvalidContentTypeException: the request doesn't contain a multipart/form-data or multipart/mixed stream, content type header is null
org.apache.tomcat.util.http.fileupload.impl.FileItemIteratorImpl.init(FileItemIteratorImpl.java:140)
org.apache.tomcat.util.http.fileupload.impl.FileItemIteratorImpl.getMultiPartStream(FileItemIteratorImpl.java:194)
org.apache.tomcat.util.http.fileupload.impl.FileItemIteratorImpl.findNextItem(FileItemIteratorImpl.java:213)
org.apache.tomcat.util.http.fileupload.impl.FileItemIteratorImpl.<init>(FileItemIteratorImpl.java:131)
org.apache.tomcat.util.http.fileupload.FileUploadBase.getItemIterator(FileUploadBase.java:255)
org.apache.tomcat.util.http.fileupload.FileUploadBase.parseRequest(FileUploadBase.java:279)
org.apache.catalina.connector.Request.parseParts(Request.java:2873)
org.apache.catalina.connector.Request.getParts(Request.java:2775)
org.apache.catalina.connector.Request.getPart(Request.java:2944)
org.apache.catalina.connector.RequestFacade.getPart(RequestFacade.java:1105)
com.bjsxt.servlet.FileUpLoadServlet.doPost(FileUpLoadServlet.java:32)
com.bjsxt.servlet.FileUpLoadServlet.doGet(FileUpLoadServlet.java:20)
javax.servlet.http.HttpServlet.service(HttpServlet.java:634)
javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
com.bjsxt.filter.EncodingFilter.doFilter(EncodingFilter.java:33)
):注意 主要问题的全部 stack 信息可以在 server logs 里查看
源码如下：
EncodingFilter：
package com.bjsxt.filter;
import javax.servlet.*;
import java.io.IOException;
/**
* 处理请求编码Filter
*/
public class EncodingFilter implements Filter {
//多线程下使用成员变量不安全，但只用来读取就不存在安全问题，就怕又读又写
private String encoding;
@Override
public void init(FilterConfig filterConfig) throws ServletException {
//根据name取对应的valuie
String code = filterConfig.getInitParameter("code");
//赋值给成员变量
this.encoding = code;
}
@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
if(encoding==null){//说明web.xml中没有设置编码格式
//设置请求编码 默认的编码
servletRequest.setCharacterEncoding("utf-8");
}else{
servletRequest.setCharacterEncoding(this.encoding);
}
System.out.println("Encoding Filter........");
//filterChain.doFilter(servletRequest,servletResponse);
}
@Override
public void destroy() {
}
}
FileUpLoadServlet：
package com.bjsxt.servlet;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.MultipartConfig;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.Part;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.UUID;
@WebServlet("/fileupload.do")
@MultipartConfig
public class FileUpLoadServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
this.doPost(req, resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//如果表单里有中文，设置请求编码
req.setCharacterEncoding("utf-8");
//设置响应编码
resp.setContentType("text/html;charset=utf-8");
//获取表单里面文件描述的值
String desc = req.getParameter("desc");
//返回part类型对象
Part part = req.getPart("file");//参数给form表单中文件上传的name
/*//获取文件上传的字节流
InputStream inputStream = part.getInputStream();*/
//给文件改名 随机生成唯一的字符串+文件扩展名
String fileName = UUID.randomUUID().toString() + part.getSubmittedFileName().substring(part.getSubmittedFileName().lastIndexOf("."));
//路径转换
ServletContext servletContext = this.getServletContext();
//把相对于webapps目录下的相对路径转换成绝对路径
String realPath = servletContext.getRealPath("images/" + fileName);
//将上传的对象做IO流处理，并通过字符输出流写到路径中
part.write(realPath);
PrintWriter out = resp.getWriter();
/*拼接HTML页面*/
out.println("<!DOCTYPE HTML PUBLIC '-//W3C//DTD HTML 4.0 Transitional//EN'>");
out.println("<HTML>");
out.println("<HEAD><TITLE> ITBZ </TITLE></HEAD>");
out.println("<BODY>");
out.println("文件上传成功！"+desc);
out.println("</BODY>");
out.println("</HTML>");
out.flush();
out.close();
}
}
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