Servlet之间传递程数据的方式

jallay · 发表于 2013-2-7 19:54:20

1：如何让用户的请求数据从一个Servlet传递给另一个Servlet

第一种方式：通过超链接传递数据
第二种方式：通过表传递取参数。
第三种方式：通过setAttribute("name",value)与getAttribute(name value)传递参数

  1)通过超链接获得参数：
需要在超链接后面给定要传递参数的值。但长度有限制

package testParameter;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class TestA extends HttpServlet{@Overrideprotected void service(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {response.setContentType("text/html");PrintWriter out=response.getWriter();String name="hello,everyone";out.println("<html>");out.println("<body>");out.println("<a href='/JSP/test?id="+name+"'>this is a test</a>");out.println("<body>");out.println("</html>");             out.flush();}}

通过request.getParameter("id")获得参数的值：

package testParameter;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class Test extends HttpServlet {@Overrideprotected void service(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {String name=request.getParameter("id");response.setContentType("text/html;charset=gb2312");PrintWriter out=response.getWriter();out.println("<html>");out.println("<body>");out.println(name);out.println("</body>");out.println("</html>");             out.flush();}}
通过表单获得参数：
package testParameter;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class TableP extends HttpServlet{@Overrideprotected void service(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {response.setContentType("text/html;charset=gb2312");PrintWriter out=response.getWriter();out.println("<html>");out.println("<body>");out.println("<form action='/JSP/tabletest' method='post'>");out.println("<table align='center'>");out.println("<tr>");out.println("<td>");out.println("username:");out.println("</td>");out.println("<td>");out.println("<input type='text' name='name'>");out.println("</td>");out.println("</tr>");out.println("<tr>");out.println("<td>");out.println("password:");out.println("</td>");out.println("<td>");out.println("<input type='text' name='pwd'>");out.println("</td>");out.println("</tr>");out.println("<tr >");out.println("<td colspan='2'>");out.println("<input type='submit' value='提交'>");out.println("</td>");out.println("</tr>");out.println("</table>");out.println("</form>");out.println("</body>");out.println("</html>");             out.flush();}}package testParameter;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class GetTableP extends HttpServlet{@Overrideprotected void service(HttpServletRequest req, HttpServletResponse resp)throws ServletException, IOException {resp.setContentType("text/html;charset=gb2312");PrintWriter out=resp.getWriter();String name=req.getParameter("name");String pwd=req.getParameter("pwd");out.println("<html>");out.println("<body>");out.println(name);out.println("<hr>");out.println(pwd);out.println("</body>");out.println("</html>");             out.flush();}}
3：通过setAttribute("name",data)和getAttribute("name");
其中data可以是任何数据类型，另一个servlet通过名字获取该对象getAttribute("name");
注：setAttriute可以被request,session,ServletContext等对象使用。以下以request为例：
package testParameter;import java.io.IOException;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class AttributeA extends  HttpServlet{@Overrideprotected void service(HttpServletRequest req, HttpServletResponse resp)throws ServletException, IOException {String data="this is just a test,wo need more test for this";req.setAttribute("name", data);req.getRequestDispatcher("/attributeb").forward(req, resp);}}package testParameter;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class AttributeB extends HttpServlet{@Overrideprotected void service(HttpServletRequest req, HttpServletResponse resp)throws ServletException, IOException {  String name=(String)req.getAttribute("name");  resp.setContentType("text/html;charset=gb2312"); PrintWriter out=resp.getWriter();  out.println("<html>"); out.println("<body>"); out.println(name); out.println("</body>"); out.println("</html>");                out.flush();}}

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Servlet之间传递程数据的方式

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