Struts2——Result

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十五、结果类型

result类型

1、dispatcher(默认类型)

2、redirect(客户端跳转)

3、chain(action)

4、rediretAction(action)

5、freemarker

6、httpHeader

7、stream

8、velocity

9、xslt

10、plaintext

11、tiles

范例：

（1）配置struts.xml。定义不同的结果类型

<?xml version="1.0" encoding="UTF-8" ?>

<!DOCTYPE struts PUBLIC

"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"

"http://struts.apache.org/dtds/struts-2.0.dtd">

</action>

</action>

</action>

</action>

</package>

</struts>

（2）分别定义4个jsp页面

<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>

String path = request.getContextPath();

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<title>My JSP 'r1.jsp' starting page</title>

<!--

-->

</head>

<body>

r1

</body>

</html>

<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>

String path = request.getContextPath();

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<title>My JSP 'r2.jsp' starting page</title>

<!--

-->

</head>

<body>

r2

</body>

</html>

<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>

String path = request.getContextPath();

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<title>My JSP 'r1.jsp' starting page</title>

<!--

-->

</head>

<body>

r3

</body>

</html>

<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>

String path = request.getContextPath();

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<title>My JSP 'r1.jsp' starting page</title>

<!--

-->

</head>

<body>

r4

</body>

</html>

（3）浏览器端访问

http://localhost:8080/ResultType/r1(浏览器端不会跳转到对应的action下的jsp页面)

http://localhost:8080/ResultTyppe/r2(客户端跳转，会跳转到对应action下的jsp页面)

http://localhost:8080/ResultTyppe/r3(forword到别的action，当需要跳转到别的包下的action时，需要配置<param name=”actionName”>、<param name=”namespace”>)

http://localhost:8080/ResultTyppe/r4

十六、全局结果GlobalResult

(1)编写index.jsp

<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>

String path = request.getContextPath();

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<title>My JSP 'index.jsp' starting page</title>

<!--

-->

</head>

<body>

</body>

</html>

(2)编写UserAction.jsp

package com.zgy.result;

import com.opensymphony.xwork2.ActionSupport;

public class UserAction extends ActionSupport{

private int type;

public int getType() {

return type;

}

public void setType(int type) {

this.type = type;

}

public String execute(){

if(type == 1){

return SUCCESS;

}

else if(type == 2){

return ERROR;

}

else{

return "mainpage";

}

(3)配置struts.xml

<?xml version="1.0" encoding="UTF-8" ?>

<!DOCTYPE struts PUBLIC

"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"

"http://struts.apache.org/dtds/struts-2.0.dtd">

<global-results>

<result name="mainpage">/mainpage.jsp</result>

</global-results>

<result name="error">/error.jsp</result>

</action>

</package>

</struts>

(4)分别编写user.jsp/error.jsp/mainpage.jsp

<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>

String path = request.getContextPath();

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<title>My JSP 'user.jsp' starting page</title>

<!--

-->

</head>

<body>

user jsp

</body>

</html>

<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>

String path = request.getContextPath();

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<title>My JSP 'error.jsp' starting page</title>

<!--

-->

</head>

<body>

error jsp

</body>

</html>

<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>

String path = request.getContextPath();

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<title>My JSP 'MainPage.jsp' starting page</title>

<!--

-->

</head>

<body>

main page

</body>

</html>

(5)浏览器端访问

http://localhost:8080/GlobleResult/

当点击3.type=3时，将会跳转到<global-results>下的mainpage.jsp

十七、动态结果集

在struts.xml中使用如下方式动态指定result的值：

${}

(1)创建index.jsp

<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>

String path = request.getContextPath();

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<title>My JSP 'index.jsp' starting page</title>

<!--

-->

</head>

<body>

</body>

</html>

(2)配置struts.xml

<?xml version="1.0" encoding="UTF-8" ?>

<!DOCTYPE struts PUBLIC

"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"

"http://struts.apache.org/dtds/struts-2.0.dtd">

</action>

</package>

</struts>

package com.zgy.result;

import com.opensymphony.xwork2.ActionSupport;

public class UserAction extends ActionSupport{

private int type;

private String r;

public int getType() {

return type;

}

public void setType(int type) {

this.type = type;

}

public String getR() {

return r;

}

public void setR(String r) {

this.r = r;

}

public String execute(){

if(type == 1){

r = "/user_success.jsp";

}

else if(type == 2){

r = "/user_error.jsp";

}

return "success";

}

(3)浏览器端访问

十八、带参数的结果集

当一个action将一个请求forward到另一个action时，不需要传递参数。即：forward是服务器端跳转，只产生一个request，一次request只有一个值栈。

当一个action将一个请求redirect到另一个action时，需要传递参数。即：redirect是客户端跳转，将产生2个request，所以这两个action不能共享同一个值栈。

范例：

（1）创建index.jsp页面，传递参数为type=1

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

String path = request.getContextPath();

String basePath = request.getScheme() + "://"

+ request.getServerName() + ":" + request.getServerPort()

+ path + "/";

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<title>My JSP 'index.jsp' starting page</title>

<!--

-->

</head>

<body>

<a href="user/user?type=1">1. 向结果传递参数</a>

</body>

</html>

（2）配置struts.xml，redirect请求到user_success.jsp

<?xml version="1.0" encoding="UTF-8" ?>

<!DOCTYPE struts PUBLIC

"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"

"http://struts.apache.org/dtds/struts-2.0.dtd">

<result type="redirect">/user_success.jsp?t=${type}</result>

</action>

</package>

</struts>

（3）编写UserAction.java接受参数值

package com.zgy.result;

import com.opensymphony.xwork2.ActionSupport;

public class UserAction extends ActionSupport {

private String type;

public String getType() {

return type;

}

public void setType(String type) {

this.type = type;

}

public String execute(){

return SUCCESS;

}

（4）编写user_success.jsp，获取参数值

<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>

<%@taglib uri="/struts-tags" prefix="s" %>

String path = request.getContextPath();

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<title>My JSP 'user_success.jsp' starting page</title>

<!--

-->

</head>

<body>

user success

from ValueStack:<s:property value="t"></s:property>

from ActionContext:<s:property value="#parameters.t"></s:property>

<s:debug></s:debug>

</body>

</html>

（5）浏览器端访问

十九、Result总结

1、常用四种类型

A)dispatcher(默认)

B)rediect

C)chain

D)redirectAction

2、全局结果集

A)global-results | extends

3、动态结果（了解）

A)在action中保存一个属性，存储具体的结果location

4、传递参数

A)客户端跳转才需要传递

B)${}表达式（不是EL）

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