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然后你前台访问的时候可能是get方式提交
两种选择
1、把后台的doGet方法实现
2、修改前台的提交方式
我分别写了一个添加书签成功和失败的Servlet,但是返回不出页面
这是为什么呀?
package cc;
import cc.Book;import java.io.IOException;
import java.io.PrintWriter;import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;/**
* Servlet implementation class Success
*/
@WebServlet("/Success")
public class Success extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public Success() {
super();
// TODO Auto-generated constructor stub
} /**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
Book book=(Book) request.getAttribute("book");
response.setContentType("text/html;charset=UTF-8");// TODO Auto-generated method stub
PrintWriter out = response.getWriter();
// TODO Auto-generated method stub
out.println("<html>");
out.println("<head>");
out.println("<title>添加书签成功</title>");
out.println("</head>");
out.println("<body>");
out.println("<h1>添加书签成功<h1>");
out.println("<ul>");
out.println("<li>书名:"+book.getName()+"</li>");
out.println("<li>作者:"+book.getAuthor()+"</li>");
out.println("<li>出版社:"+book.getChuban()+"</li>");
out.println("</ul>");
out.println("</body>");
out.println("</html>");
out.close();
} protected void doGet(HttpServletRequest request,HttpServletResponse response)throws ServletException,IOException{
doPost(request, response);
}}
//这是Error的代码
package cc;import java.io.IOException;
import java.io.PrintWriter;
import java.util.Iterator;
import java.util.List;import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;/**
* Servlet implementation class Error
*/
@WebServlet("/Error")
public class Error extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public Error() {
super();
// TODO Auto-generated constructor stub
} /**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");// TODO Auto-generated method stub
PrintWriter out = response.getWriter();
out.println("<html>");
out.println("<head>");// TODO Auto-generated method stub
out.println("<title>书签添加失败</title>");
out.println("<body>");
out.println("<h1>书签添加失败<h1>");
out.println("<ul style=\"color:rgb(255,0,0);\">");
List errorList=(List) request.getAttribute("errors");
Iterator<String>errors=errorList.iterator();
while(errors.hasNext()){
out.println("<li>"+errors.next()+"</li>");
}
out.println("</ul>");
out.println("</body>");
out.println("</html>");
}
protected void doGet(HttpServletRequest request,HttpServletResponse response)throws ServletException,IOException{
doPost(request, response);
}
}