紧急求助！关于改变提交方式！100分

Question

Have you tried using the doc package

Answer 1

我觉得很难，不过还可以一用，我用了好像还行，不知道到底行不行，如果没达到你的要求，可再讨论。第一个ReplaceHeader.java：import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import java.util.Vector;
import java.util.Enumeration;public class ReplaceHeader extends HttpServletRequestWrapper
{
public ReplaceHeader(HttpServletRequest request)
{
super(request);
}

public String getHeader(String name)  
{
if(name.equalsIgnoreCase("METHOD"))
{
return "POST";
}
return super.getHeader(name);
}
public Enumeration getHeaders(String name)
{
if(name.equalsIgnoreCase("METHOD"))
{
Vector method = new Vector(1);
method.addElement("POST");
return method.elements();
}
return super.getHeaders(name);
}

public String getMethod()
{
return "POST";
}
}第二个FilterMethod.java：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 FilterMethod implements Filter
{
private FilterConfig config;
protected String encoder;
public void init(FilterConfig config)
{
this.config = config;
}
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)throws IOException,ServletException
{
HttpServletRequest httpRequest = (HttpServletRequest)request;
ReplaceHeader rh = new ReplaceHeader(httpRequest);
chain.doFilter(rh, response);
}
public void destroy()
{
}
}WEB-INF/web.xml加入：  <filter>
    <filter-name>ReplaceMethod</filter-name>
    <description>replaces the method of the request.</description>
    <filter-class>FilterMethod</filter-class>
  </filter>  <filter-mapping>
    <filter-name>ReplaceMethod</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>web.xml的配置你应该不成问题的吧。测试testRequest.java:import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.ServletException;
import java.io.PrintWriter;
import java.io.IOException;public class testRequest extends HttpServlet
{
protected void doPost(HttpServletRequest request, HttpServletResponse response)throws IOException,ServletException
{
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
String str = "post";
System.out.println(str);
out.println(str);
}
}