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Java动态代理(解决编码问题)

2014-03-26 02:08 369 查看

1.1GetPostEncodingFilter过滤器类

public class GetPostEncodingFilter implements Filter {
public void destroy() {
}
public void doFilter(ServletRequest req, ServletResponse res,FilterChain chain) throws IOException, ServletException {
//强转
HttpServletRequest request = (HttpServletRequest) req;
HttpServletResponse response = (HttpServletResponse) res;
//创建普通类
RequestProxy requestProxy = new RequestProxy(request);
//设置响应类型与编码
response.setContentType("text/html;charset=UTF-8");
//发行请求，进入GetPostServlet
chain.doFilter(requestProxy.getProxy(),response);
}
public void init(FilterConfig filterConfig) throws ServletException {
}
}

1.2HttpServletRequest的动态代理对象

/**
* @author Administrator
* 用于产生HttpServletRequest的动态代理对象
*/
class RequestProxy{
/**
* 目标对象
*/
private HttpServletRequest request;
/**
* 通过构造器为request设置值
*/
public RequestProxy(HttpServletRequest request) {
this.request = request;
}
/**
* 产生HttpServletRequest的代理对象(重点)
*/
public HttpServletRequest getProxy(){
return (HttpServletRequest)Proxy.newProxyInstance(
this.getClass().getClassLoader(),
request.getClass().getInterfaces(),
new InvocationHandler(){
public Object invoke(Object proxy, Method method,Object[] args) throws Throwable {
Object returnValue = "";
String methodName = method.getName();
if("getParameter".equals(methodName)){
//获取客户端请求的类型
String requestType = request.getMethod();
//如果是GET请求的话
if("GET".equals(requestType)){
//获取表单提交的用户名和性别
String temp = (String) method.invoke(request,args);
//如果非空
if(temp!=null && temp.trim().length()>0){
//转还
byte[] buf = temp.getBytes("ISO8859-1");
//手工装配
returnValue = new String(buf,"UTF-8");
}
//如果是POST请求的话
}else if("POST".equals(requestType)){
//设置编码方式
request.setCharacterEncoding("UTF-8");
//获取表单提交的用户名和性别
returnValue = method.invoke(request,args);
}
}else{
returnValue = method.invoke(request,args);
}
return returnValue;
}
});
}
}

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