STRUTS2result配置和类型转换,通配符配置*,OGNL，注册form表单提交,例子【诗书画唱】

八卦谈佚名 ▪ 2024-01-13 14:35:06

本期导读：STRUTS2result配置和类型转换，返回结果配置的PPT，类型转换的PPT，通配符配置*,OGNL,例子，success叫逻辑视图名，注册form表单提交，讲义

返回结果配置的PPT START

返回结果配置的PPT END

类型转换的PPT START

Struts2提供了非常强大的类型转换机制，只要把HTTP参数命名为合法的OGNL表达式，就可以对表单元素和其他GET/POST的参数使用类型转换机制。同时，Struts2框架为类型转换提供了可扩展性，开发者可以自行定义类型转换器。例如，完成字符串到对象实例的转换

Struts2内部提供大量类型转换器，用来完成数据类型转换问题：

String和boolean、Boolean：完成字符串与布尔值之间的转换

String和char、Character：往常字符串与字符之间的转换

String和int、Integer：完成字符串与整型之间的转换

String和long、Long：完成字符串与长整型值之间的转换

String和double、Double：完成字符串与双精度浮点值的转换

String和float、Float：完成字符串和单精度浮点之间的转换

String和Date：完成字符串和日期类型之间的转换，可以接收yyyy-MM-dd格式字符串

String和数组：可以将多个同名参数，转换到数组中

String和Map、List：支持将数据保存到List或者Map集合

类型转换的PPT END

讲义 START

一、result标签的用法

servlet实现功能：转发和重定向，往页面传递一个字符串response.getWriter().writer();附件上传

type="dispatcher"和type="redirect"的用法

转发：只能跳转到本项目的页面

重定向：可以跳转到外部的网页去

OGNL：对象导航语言

通配符配置*：

讲义 END

例子 START

package com.jy.action;

public class NaviAction {

//http://localhost:8080/J190802/pub/to_indexAc.action

public String to_index(){

return "index";

}

package com.jy.action;

public class OneAction {

//http://localhost:8888/J190802/pub/oneAc.action

public String test(){

//success叫逻辑视图名

return "success";

}

package com.jy.action;

public class ProductAction {

//http://localhost:8080/J190802/pro/toAddAc.action

public String toAdd(){

//跳转到错误页面

return "error";

}

public String toList(){

//跳转到错误页面

return "error";

}

package com.jy.action;

import java.util.Date;

import com.jy.bean.User;

public class PubAction {

private User user;

public User getUser() {

return user;

}

public void setUser(User user) {

this.user = user;

}

public String doReg(){

System.out.println(user.getName());

System.out.println(user.isFlag());

String[]hbs = user.getHobbys();

for(String hb : hbs) {

System.out.println(hb);

}

return "success";

}

package com.jy.action;

public class TwoAction {

private String target;

public String getTarget() {

return target;

}

public void setTarget(String target) {

this.target = target;

}

//http://localhost:8888/J190802/pub/twoAc.action

public String gotoPage(){

//跳转到百度页面www.baidu.com

target = "jd";

return "success";

}

package com.jy.bean;

import java.util.Date;

public class User {

private String name;

private Date birthday;

private String sex;

private String[]hobbys;

private boolean flag;

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public Date getBirthday() {

return birthday;

}

public void setBirthday(Date birthday) {

this.birthday = birthday;

}

public String getSex() {

return sex;

}

public void setSex(String sex) {

this.sex = sex;

}

public String[] getHobbys() {

return hobbys;

}

public void setHobbys(String[] hobbys) {

this.hobbys = hobbys;

}

public boolean isFlag() {

return flag;

}

public void setFlag(boolean flag) {

this.flag = flag;

}

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

<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">

<action name="oneAc" class="com.jy.action.OneAction"

method="test">

<param name="location">/hello.jsp</param>

</result>

</action>

<action name="twoAc" class="com.jy.action.TwoAction"

method="gotoPage">

<result type="redirect">http://www.${target}.com</result>

</action>

<action name="to_*Ac" class="com.jy.action.NaviAction"

method="to_{1}">

</action>

</package>

<global-results>

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

</global-results>

<action name="toAddAc" class="com.jy.action.ProductAction"

method="toAdd">

</action>

<action name="toListAc" class="com.jy.action.ProductAction"

method="toList">

</action>

</package>

<action name="regAc" class="com.jy.action.PubAction"

method="doReg">

<result>/success.jsp</result>

</action>

</package>

</struts>

<%@ page language="java" contentType="text/html; charset=UTF-8" 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>

</head>

<body>

<h1>Hello world</h1>

</body>

</html>

注册form表单提交：

<%@ page language="java" contentType="text/html; charset=UTF-8" 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>

</head>

<body>

<br>

<br>

<input type="radio" name="user.sex" value="男"/>男

<input type="radio" name="user.sex" value="女"/>女

<br>

<input type="checkbox" name="user.hobbys" value="读书"/>读书

<input type="checkbox" name="user.hobbys" value="街舞"/>街舞

<input type="checkbox" name="user.hobbys" value="电影"/>电影

<br>

</form>

</body>

</html>

例子 END