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struts2 请求参数接收

2024-08-07 23:22:51   219人阅读

1. 采用基本类型接受请求参数(get/post)
在Action类中定义与请求参数同名的属性，struts2便能自动接收请求参数并赋予给同名的属性。
请求路径：http://localhost:8080/action/register.action?id=33

public class HelloWorldAction {private Integer id;public Integer getId() {return id;}public void setId(Integer id) {this.id = id;}}

 2. 采用复合类型接受请求参数
请求路径：http://localhost:8080/action/register.action?id=79

public class HelloWorldAction {private Person person;public Person getPerson() {return person;}public void setPerson(Person person) {this.person = person;}}

 

获取Bean属性的原理：
Struts2首先通过反射技术调用Person的默认构造器创建person的实例，然后再通过反射技术调用person中与请求参数同名的属性的setter方法，来获取请求参数数值。

实体bean

package com.ljq.bean;public class Person {private String name;private Integer id;public String getName() {return name;}public void setName(String name) {this.name = name;}public Integer getId() {return id;}public void setId(Integer id) {this.id = id;}}

 HelloWorldAction类

package com.ljq.action;import com.ljq.bean.Person;public class HelloWorldAction {//基本类型请求参数private Integer id;private String name;//复合类型请求参数private Person person;public String execute(){return "success";}public Person getPerson() {return person;}public void setPerson(Person person) {this.person = person;}public Integer getId() {return id;}public void setId(Integer id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}}

 index.jsp请求页面

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><title>My JSP ‘index.jsp‘ starting page</title><meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0"></head><body><!-- get方法发送，如果是中文则会出现乱码，post不会，好像struts2.1.8有修正此问题基本类型get请求参数: http://localhost:8083/struts2/control/employee/executeHelloWorld.do?id=1&name= zhangsan复合类型get请求参数: http://localhost:8083/struts2/control/employee/executeHelloWorld.do?person.id=2&person.name=lisihttp://localhost:8083/struts2/control/employee/executeHelloWorld.do?id=1&name=zhangsan&person.id=2&person.name=lisi--><!-- post方法发送 --><form action="<%=request.getContextPath()%>/control/employee/executeHelloWorld.do" method="post"><!-- 基本类型请求参数 -->id:<input type="text" name="id"><br/>name:<input type="text" name="name"><br/><!-- 复合类型请求参数 -->person.id:<input type="text" name="person.id"><br/>person.name:<input type="text" name="person.name"><br/><input type="submit" value="http://www.mamicode.com/发送"/></form></body></html>

 显示页面

<%@ page language="java" import="java.util.*,java.net.*" pageEncoding="UTF-8"%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><title>My JSP ‘message.jsp‘ starting page</title><meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0"></head><body><!-- 输出基本类型请求参数 -->id=${id}<br/>name=${name}<br/><!-- 输出复合类型请求参数 -->person.id=${person.id }<br/>person.name=${person.name }<br/></body></html>

 struts.xml配置文件

<?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"><struts><constant name="struts.i18n.encoding" value="http://www.mamicode.com/UTF-8" /><constant name="struts.enable.DynamicMethodInvocation" value="http://www.mamicode.com/false" /><constant name="struts.action.extension" value="http://www.mamicode.com/do,go" /><package name="employee" namespace="/control/employee" extends="struts-default"><action name="*HelloWorld" class="com.ljq.action.HelloWorldAction" method="{1}"><result name="success">/WEB-INF/page/message.jsp</result></action></package></struts>

 

struts2 请求参数接收


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