JAvawebでフィルタを使用して文字化けし問題を解決する

3809 ワード
formフォームコミットページ、getメソッドまたはpostメソッドを使用してコミット:
index.jsp 
<<span style="font-size:18px;">%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<html>
  <head>
  </head>
  <body>
    <form action="${pageContext.request.contextPath }/servlet/fromAndroidServlet" method="post">
        :<input type="text" name="title"><br/>
        :<input type="text" name="timeLength"><br/>
      <input type="submit" value="  ">
    </form>
  </body>
</html></span>

fromAndroidServlet 
package com.example.servlet;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class fromAndroidServlet extends HttpServlet {

	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		String title = request.getParameter("title");
		String timeLength = request.getParameter("timeLength");
		System.out.println("title="+title);
		System.out.println("timeLength="+timeLength);
	}
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		doGet(request, response);
	}

}

フィルタEncodingFilter.java
package com.example.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;

public class EncodingFilter implements Filter{

	@Override
	public void destroy() {
		
	}

	@Override
	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
		HttpServletRequest req = (HttpServletRequest) request;
		if("GET".equals(req.getMethod())){
			EncodingHttpServletRequest wraper = new EncodingHttpServletRequest(req);
			chain.doFilter(wraper, response);
		}else{
			req.setCharacterEncoding("UTF-8");
			chain.doFilter(request, response);
		}
	}

	@Override
	public void init(FilterConfig filterConfig) throws ServletException {
		
	}
}

EncodingHttpServletRequest.java 
package com.example.filter;

import java.io.UnsupportedEncodingException;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;

public class EncodingHttpServletRequest extends HttpServletRequestWrapper{

	private HttpServletRequest request;
	public EncodingHttpServletRequest(HttpServletRequest request) {
		super(request);
		this.request = request;
	}
	@Override
	public String getParameter(String name) {
		String value = request.getParameter(name);
		try {
			if(value!=null){
				//tomcat     ISO8859-1
				value = new String(value.getBytes("ISO8859-1"),"UTF-8");
			}
		} catch (UnsupportedEncodingException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return value;
	}
}

Web.xmlの構成:
 <filter>
    <filter-name>EncodingFilter</filter-name>
    <filter-class>com.example.filter.EncodingFilter</filter-class>
</filter>
<filter-mapping>
    <filter-name>EncodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>
デジタル証明書は何ですか.その内容が含まれています.
Androidプロジェクト開発経験まとめ