Struts2的类型转换

Terwer...大约 3 分钟后端开发Struts2使用标签注意转换strutsstruts2taglibconvertvalidate

使用标签

注意：Struts2使用标签库找不到URI:[struts-tags]的taglib[s]问题解决open in new window

新建 login2.jsp​ 文件，内容如下：

<%@ page language="java" contentType="text/html; charset=UTF-8"
	pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags" %>

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Struts2.3 Login2</title>
</head>
<body>
	<s:form action="login">
		<s:textfield name="username" label="username"></s:textfield>
		<s:textfield name="password" label="password"></s:textfield>
		<s:submit label="submit"></s:submit>
	</s:form>
</body>
</html>

查看结果：

​

在 Action 中使用 ActionSupport

新增页面

​login3.jsp​

<%@ page language="java" contentType="text/html; charset=UTF-8"
	pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags" %>

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Struts2.3 Login3</title>
</head>
<body>
	<s:form action="login3">
		<s:textfield name="username" label="username"></s:textfield>
		<s:textfield name="password" label="password"></s:textfield>
		<s:submit label="submit"></s:submit>
	</s:form>
</body>
</html>

​LoginAction3.java​

package space.terwer;

import org.apache.commons.lang3.StringUtils;

import com.opensymphony.xwork2.ActionSupport;

public class LoginAction3 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;
	}

	@Override
	public void validate() {
		if(StringUtils.isBlank(this.getUsername())) {
			this.addFieldError("username", "username required");
		}
		if(StringUtils.isBlank(this.getPassword())) {
			this.addFieldError("password", "password required");
		}
	}

	public String execute() {
		return "success";
	}
}

修改 struts.xml 添加校验跳转 input

​struts.xml​

<!-- 使用ActionSupport -->
<action name="login3" class="space.terwer.LoginAction3">
	<result name="success">/result.jsp</result>
	<result name="input">/login3.jsp</result>
</action>

效果

​

业务验证

在 LoginAction2.java​ 的 execute()​ 方法添加验证逻辑

public String execute() {
	if("hello".equals(this.getUsername().trim()) && "world".equals(this.getPassword().trim())){
		return "success";
	}

	this.addFieldError("username", "username or password error");
	return "failer";
}

在 struts.xml​ 加入跳转逻辑

<!-- 使用ActionSupport -->
<action name="login3" class="space.terwer.LoginAction3">
	<result name="success">/result.jsp</result>
	<result name="input">/login3.jsp</result>
	<result name="failer">/login3.jsp</result>
</action>

效果

​

注意：result.jsp​ 里面的两种写法等价。

username:${requestScope.username}<br /> 
password:${requestScope.password }

username:<%=request.getParameter("username") %><br /> 
password:<%=request.getParameter("password") %>

类型转换深入

新建一个 input.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags" %>
  
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Struts2.3 convert test</title>
</head>
<body>

	<h3 style="color:red;">使用逗号将点的两个坐标分隔开</h3>
	<s:form action="pointConverter">
		<s:textfield name="point" label="point"></s:textfield>
		<s:textfield name="age" label="age"></s:textfield>
		<s:textfield name="username" label="username"></s:textfield>
		<s:textfield name="date" label="birthday"></s:textfield>
	
		<s:submit value="Submit"></s:submit>
	</s:form>
</body>
</html>

​

Point 对象

新建一个 bean​ 为 Point.java​

package space.terwer.bean;

public class Point {
	private Integer x;
	private Integer y;

	public Integer getX() {
		return x;
	}

	public void setX(Integer x) {
		this.x = x;
	}

	public Integer getY() {
		return y;
	}

	public void setY(Integer y) {
		this.y = y;
	}
}

OGNL 官网

https://commons.apache.org/proper/commons-ognl/open in new window

新的官网

https://github.com/apache/commons-ognlopen in new window

新建一个类型转换器类 PointConverter

package space.terwer.converter;

import java.util.Map;

import ognl.DefaultTypeConverter;
import space.terwer.bean.Point;

public class PointConverter extends DefaultTypeConverter {

	@Override
	public Object convertValue(Map context, Object value, Class toType) {
		if (Point.class == toType) {
			Point point = new Point();

			String[] str = (String[]) value;
			String[] paramValues = str[0].split(",");

			Integer x = new Integer(paramValues[0]);
			Integer y = new Integer(paramValues[1]);

			point.setX(x);
			point.setY(y);

			return point;
		}

		if (String.class == toType) {
			Point point = (Point) value;

			int x = point.getX();
			int y = point.getY();

			String result = "[x=" + x + ", y=" + y + "]";

			return result;
		}

		return null;
	}

}

新建一个 PointAction 处理类

package space.terwer.action;

import java.util.Date;

import com.opensymphony.xwork2.ActionSupport;

import space.terwer.bean.Point;

public class PointAction extends ActionSupport {
	private Point point;
	private Integer age;
	private String username;
	private Date date;

	public Point getPoint() {
		return point;
	}

	public void setPoint(Point point) {
		this.point = point;
	}

	public Integer getAge() {
		return age;
	}

	public void setAge(Integer age) {
		this.age = age;
	}

	public String getUsername() {
		return username;
	}

	public void setUsername(String username) {
		this.username = username;
	}

	public Date getDate() {
		return date;
	}

	public void setDate(Date date) {
		this.date = date;
	}

	@Override
	public String execute() throws Exception {
		return SUCCESS;
	}
}

struts.xml 添加处理流程配置：

<action name="pointConverter" class="space.terwer.action.PointAction">
	<result name="success">/output.jsp</result>
</action>

新增转换器配置

必须在当前 Action 同级目录新建 Action类名-conversion.properties​ ，例如：

PointAction-conversion.properties

内容为 需要转换的属性名称​ 和 转换器全路径​ ，例如本例子内容如下：

point=space.terwer.converter.PointConverter

重启服务器。

特别指出：转换器文件前面必须是Action类名，后缀必须是：

-conversion.properties

​

output.jsp 显示页面

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags" %>  
  
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Point result</title>
</head>
<body>

	point:<s:property value="point" /><br/>
	age:<s:property value="age" /><br/>
	username:<s:property value="username" /><br/>
	date:<s:property value="date" />

</body>
</html>

查看效果

​

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