📄 paramlistservlet2.java
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package cn.com.tarena.web.servlet.day2;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class ParamListServlet2 extends HttpServlet{
public void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException{
//设置MINE格式
response.setContentType("text/html");
//获得能够往客户端输出HTML的书写器
PrintWriter out = response.getWriter();
out.println("<html>");
out.println("<head>");
out.println(" <title>Params</title>");
out.println("</head>");
out.println("<body>");
out.println("<h2 align=\"center\">All parameters in the current request</h2>");
out.println("<hr>");
out.println("<ol>");
//获得存放了请求中所有参数名的枚举对象
Map paramMap = request.getParameterMap();
Iterator it = paramMap.entrySet().iterator();
while(it.hasNext()){
Entry entry = (Entry)it.next();
String name = (String)entry.getKey();
String[] values = (String[])entry.getValue();
out.println(" <li>" + name + " = " + join(values,",") + "</li>");
}
out.println("</ol>");
out.println("</body>");
out.println("</html>");
out.close();
}
private String join(String[] values, String appender) {
StringBuffer strBf = new StringBuffer();
for(int i = 0;i < values.length;i++){
if(i != 0){
strBf.append(appender);
}
strBf.append(values[i]);
}
return strBf.toString();
}
public void doPost(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException{
doGet(request,response);
}
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