struts2之Action请求参数接收方式
一、struts2发送处理请求流程
客户端发送请求 —> tomcat接收请求 -> 根据项目工程加载处理web.xml -> 把请求交给struts filter来处理,struts filter交给doFilter处理 -> doFilter根据struts.xml找到对应的namespace、action及action处理完成返回的信息来显示调用对应的result页面 -> 返回给客户端。
二、struts2请求接收方式
1、采用基本类型接收请求参数（get/post）
在Action类中定义与请求参数同名的属性，struts2就能自动接收请求参数并赋予给同名属性。
1）get方法接收请求参数
请求路径：http://172.22.6.9:8888/struts2/login.action?username=etccbw&password=123456
employee.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN" "http://struts.apache.org/dtds/struts-2.3.dtd">
<struts>
<!-- 配置struts2处理请求后缀 -->
<constant name="struts.action.extension" value="do,action"></constant>
<package name="employee" extends="struts-default">
<action name="login" class="com.casv.action.employeeAction" method="all">
<result name="allemp">/emp/allpage.jsp</result>
</action>
</package>
</struts>
employeeAction.java
public class employeeAction extends ActionSupport {
private String username;
private String password;
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
// 查询
public String all() {
System.out.println("查询员工信息...,");
return "allemp";
}
// 添加
public String add() {
return this.all();
}
}
allpage.jsp
<body>
username:${username},password:${password}
</body>
2）post方法接收请求参数
请求路径：http://localhost:8888/struts2/
employee.xml、employeeAction.java及allpage.jsp不变，添加login.jsp
<form action="${pageContext.request.contextPath}/login.action" method="post">
<table align="center">
<tr>
<td colspan="2">用户登陆</td>
</tr>
<tr>
<td>账号：</td>
<td><input type="text" name="username" size="30px;"></td>
</tr>
<tr>
<td>密码：</td>
<td><input type="text" name="password" size="30px;"></td>
</tr>
<tr>
<td colspan="2">
<input type="submit" value="提交">
</td>
</tr>
</table>
</form>
2、采用复合类型接收请求参数employee.xml
<struts>
<!-- 配置struts2处理请求后缀 -->
<constant name="struts.action.extension" value="do,action"></constant>
<package name="employee" extends="struts-default">
<action name="login" class="com.casv.action.employeeAction" method="all">
<result name="allemp">/emp/allpage.jsp</result>
</action>
</package>
</struts>
empEntity.java
public class empEntity {
private String username;
private String password;
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
}
employeeAction.java
public class employeeAction extends ActionSupport {
empEntity emp;
public empEntity getEmp() {
return emp;
}
public void setEmp(empEntity emp) {
this.emp = emp;
}
// 查询
public String all() {
System.out.println("查询员工信息...,");
return "allemp";
}
}
login.jsp
<form action="${pageContext.request.contextPath}/login.action" method="post">
<table align="center">
<tr>
<td colspan="2">用户登陆</td>
</tr>
<tr>
<td>账号：</td>
<td><input type="text" name="emp.username" size="30px;"></td>
</tr>
<tr>
<td>密码：</td>
<td><input type="text" name="emp.password" size="30px;"></td>
</tr>
<tr>
<td colspan="2">
<input type="submit" value="提交">
</td>
</tr>
</table>
</form>
allpage.jsp
<body>
username:${emp.username},password:${emp.password}
</body>
说明：当类中的参数比较多时，建议采用复合类型，较少两者均可。