servlet post get乱码

最新推荐文章于 2024-02-18 13:54:40 发布

tao.xing

最新推荐文章于 2024-02-18 13:54:40 发布

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分类专栏： servlet jsp 文章标签： servlet 乱码 post get 乱码

本文链接：https://blog.youkuaiyun.com/hhlxxt/article/details/52474002

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本文介绍了一种通过自定义过滤器解决Servlet中GET请求参数乱码的方法。通过重写getParameter方法并设置字符编码为UTF-8，确保了中文等特殊字符能够正确显示。

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对于servlet中请求乱码解决方法，写一个过滤器进行解决，对于get方式的重写getParameter方法(可以直接修改web容器的编码):

package com.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;
import javax.servlet.http.HttpServletResponse;

import com.util.MyRequest;

public class FirstFilter implements Filter{

private FilterConfig filterConfig;

@Override
public void destroy() {
// TODO Auto-generated method stub

}

@Override
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException {
HttpServletRequest req =(HttpServletRequest)request;
HttpServletResponse res =(HttpServletResponse)response;

String encoding=filterConfig.getInitParameter("encoding");

req.setCharacterEncoding(encoding);
res.setCharacterEncoding(encoding);

MyRequest httpRequest = new MyRequest(req);

System.out.println("-----FirstFilter init----");
chain.doFilter(httpRequest, response);
System.out.println("-----FirstFilter destroy----");

}

@Override
public void init(FilterConfig filterConfig) throws ServletException {
this.filterConfig = filterConfig ;

}

}

package com.util.;

import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;

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

public class MyRequestextends HttpServletRequestWrapper {

public MyRequest(HttpServletRequest request) {
super(request);
}

@Override
public String getParameter(String name) {
String value = super.getParameter(name);
if(value ==null){
return null;
}
String method = super.getMethod();
if("get".equalsIgnoreCase(method)){
try {
value = new String(value.getBytes("ISO-8859-1"), super.getCharacterEncoding());
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
}
return value;
}

}

在web.xml中进行配置

<filter>
<filter-name>FirstFilter</filter-name>
<filter-class>com.filter.FirstFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>utf-8</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>FirstFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>

当然对于get请求的乱码也可以直接修改web容器的编码