Struts(二十一)：类型转换与复杂属性、集合属性配合使用

• 背景：

　　本章节主要以复杂属性、集合属性类型转化为例，来学习这两种情况下怎么使用。

• 复杂对象属性转换场景：

1、新建struts_04

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_9" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
    <display-name>Struts 02</display-name>
    <filter>
        <filter-name>struts2</filter-name>
        <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>struts2</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
    <welcome-file-list>
        <welcome-file>index.jsp</welcome-file>
    </welcome-file-list>
</web-app>

struts.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>
    <package name="default" namespace="/" extends="struts-default">
        <action name="abstractPropertyAction" class="com.dx.struts2app.ConversionAction" method="execute">
            <result>/success.jsp</result>
            <result name="input">/index.jsp</result>
        </action>
    </package>
</struts>

com.dx.struts2app.ConversionAction.java

package com.dx.struts2app;

import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.ModelDriven;

public class ConversionAction extends ActionSupport implements ModelDriven<Member> {
    private static final long serialVersionUID = 1L;
    private Member member;

    public String execute() {
        System.out.println(this.member);

        return SUCCESS;
    }

    @Override
    public Member getModel() {
        member = new Member();
        return member;
    }
}

com.dx.struts2app.Member.java(Member属性中包含了department属性)

package com.dx.struts2app;

public class Member {
    private String id;
    private String name;
    private Department department;

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Department getDepartment() {
        return department;
    }

    public void setDepartment(Department department) {
        this.department = department;
    }

    @Override
    public String toString() {
        return "Member [id=" + id + ", name=" + name + ", department=" + department + "]";
    }

}

com.dx.struts2app.Department.java

package com.dx.struts2app;

import java.awt.Point;
import java.util.Date;

public class Department {
    private String name;
    private Point position;
    private Date createTime;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Point getPosition() {
        return position;
    }

    public void setPosition(Point position) {
        this.position = position;
    }

    public Date getCreateTime() {
        return createTime;
    }

    public void setCreateTime(Date createTime) {
        this.createTime = createTime;
    }

    @Override
    public String toString() {
        return "Department [name=" + name + ", position=" + position + ", createTime=" + createTime + "]";
    }

}

com.dx.converters.PointConverter.java

package com.dx.converters;

import java.awt.Point;
import java.util.Map;

import org.apache.struts2.util.StrutsTypeConverter;

public class PointConverter extends StrutsTypeConverter {
    public PointConverter() {
        System.out.println("PointConverter's constructor...");
    }

    @Override
    public Object convertFromString(Map context, String[] values, Class toClass) {
        System.out.println("convertFromString...");

        if (toClass == Point.class) {
            if (values != null && values.length > 0 && values[0].indexOf(",") > 0) {
                try {
                    int x = Integer.valueOf(values[0].split(",")[0]);
                    int y = Integer.valueOf(values[0].split(",")[1]);

                    return new Point(x, y);
                } catch (Exception ex) {
                    ex.printStackTrace();
                }
            }
        }

        return values;
    }

    @Override
    public String convertToString(Map context, Object o) {
        System.out.println("convertToString...");

        if (o instanceof Point) {
            Point point = (Point) o;
            return point.getX() + "," + point.getY();
        }
        return null;
    }

}

src下新建文件xwork-conversion.properties，并编辑内容：

java.awt.Point=com.dx.converters.PointConverter

index.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>My test page</title>
</head>
<body>
    <s:debug></s:debug>
    <s:form action="abstractPropertyAction" method="post">
        <s:textfield name="name" label="Name"></s:textfield>
        <s:textfield name="department.name" label="department.name"></s:textfield>
        <s:textfield name="department.position" label="department.position"></s:textfield>
        <s:textfield name="department.createTime"
            label="department.createTime"></s:textfield>
        <s:submit label="提交"></s:submit>
    </s:form>
</body>
</html>

success.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
SUCCESS!
</body>
</html>

访问index.jsp,并提交:

成功提交了，成功的转换了java.awt.Point：

后台打印信息：

2017-04-04 15:01:20,259 INFO  [localhost-startStop-1] log4j2.Log4j2Logger (Log4j2Logger.java:45) - Choosing bean (struts) for (com.opensymphony.xwork2.security.AcceptedPatternsChecker)
PointConverter's constructor...
四月 04, 2017 3:01:20 下午 org.apache.catalina.startup.HostConfig deployDirectory
信息: Deploying web application directory D:\Work\Java\apache-tomcat-7.0.75-windows-x64\apache-tomcat-7.0.75\webapps\docs
四月 04, 2017 3:01:20 下午 org.apache.catalina.startup.HostConfig deployDirectory
。。。。。。
信息: Starting ProtocolHandler ["ajp-bio-8009"]
四月 04, 2017 3:01:20 下午 org.apache.catalina.startup.Catalina start
信息: Server startup in 6488 ms
convertFromString...
Member [id=null, name=123, department=Department [name=234, position=java.awt.Point[x=5,y=6], createTime=Tue Apr 04 14:44:45 CST 2017]]

• 复杂对象属性转换场景：

修改Member.java类：

package com.dx.struts2app;

import java.util.ArrayList;
import java.util.List;

import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.ModelDriven;

public class ConversionAction extends ActionSupport implements ModelDriven<List<Member>> {
    private static final long serialVersionUID = 1L;
    private List<Member> members;

    public String execute() {
        System.out.println(this.members);

        return SUCCESS;
    }

    public List<Member> getMembers() {
        return members;
    }

    public void setMembers(List<Member> members) {
        this.members = members;
    }

    @Override
    public List<Member> getModel() {
        members = new ArrayList<Member>();
        return members;
    }
}

修改index.jsp  页面：

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>My test page</title>
</head>
<body>
    <s:debug></s:debug>
    <s:form action="abstractPropertyAction" method="post">
        <s:textfield name="members[0].name" label="members[0].Name"></s:textfield>
        <s:textfield name="members[0].department.name" label="members[0].department.name"></s:textfield>
        <s:textfield name="members[0].department.position" label="members[0].department.position"></s:textfield>
        <s:textfield name="members[0].department.createTime" label="members[0].department.createTime"></s:textfield>
        <br/>
        <s:textfield name="members[1].name" label="members[1].Name"></s:textfield>
        <s:textfield name="members[1].department.name" label="members[1].department.name"></s:textfield>
        <s:textfield name="members[1].department.position" label="members[1].department.position"></s:textfield>
        <s:textfield name="members[1].department.createTime" label="members[1].department.createTime"></s:textfield>
        <s:submit label="提交"></s:submit>
    </s:form>
</body>
</html>

访问index.jsp页面：

提交表单成功，后台打印信息：

。。。。。。
2017-04-04 15:28:57,351 INFO  [localhost-startStop-1] log4j2.Log4j2Logger (Log4j2Logger.java:45) - Choosing bean (struts) for (com.opensymphony.xwork2.security.AcceptedPatternsChecker)
PointConverter's constructor...
信息: Starting ProtocolHandler ["ajp-bio-8009"]
四月 04, 2017 3:28:59 下午 org.apache.catalina.startup.Catalina start
。。。。。。
信息: Server startup in 8302 ms
2017-04-04 15:29:06,546 WARN  [http-bio-8080-exec-3] log4j2.Log4j2Logger (Log4j2Logger.java:57) - No configuration found for the specified action: 'abstractPropertyAction' in namespace: ''. Form action defaulting to 'action' attribute's literal value.
convertFromString...
convertFromString...
[Member [id=null, name=12, department=Department [name=11, position=java.awt.Point[x=2,y=3], createTime=Tue Apr 04 15:13:20 CST 2017]], Member [id=null, name=121, department=Department [name=111, position=java.awt.Point[x=21,y=31], createTime=Tue Apr 04 15:13:21 CST 2017]]]

• 集合嵌套集合属性类型转换（基于集合属性类型转换修改）：

Member.java

package com.dx.struts2app;

import java.util.List;

public class Member {
    private String id;
    private String name;
    private List<Department> departments;

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public List<Department> getDepartments() {
        return departments;
    }

    public void setDepartments(List<Department> departments) {
        this.departments = departments;
    }

    @Override
    public String toString() {
        return "Member [id=" + id + ", name=" + name + ", departments=" + departments + "]";
    }
}

index.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>My test page</title>
</head>
<body>
    <s:debug></s:debug>
    <s:form action="abstractPropertyAction" method="post">
        <s:textfield name="members[0].name" label="members[0].Name"></s:textfield>
        <s:textfield name="members[0].departments[0].name" label="members[0].departments[0].name"></s:textfield>
        <s:textfield name="members[0].departments[0].position" label="members[0].departments[0].position"></s:textfield>
        <s:textfield name="members[0].departments[0].createTime" label="members[0].departments[0].createTime"></s:textfield>

        <s:textfield name="members[0].departments[1].name" label="members[0].departments[1].name"></s:textfield>
        <s:textfield name="members[0].departments[1].position" label="members[0].departments[1].position"></s:textfield>
        <s:textfield name="members[0].departments[1].createTime" label="members[0].departments[1].createTime"></s:textfield>

        <s:textfield name="members[1].name" label="members[1].Name"></s:textfield>
        <s:textfield name="members[1].departments[0].name" label="members[1].departments[0].name"></s:textfield>
        <s:textfield name="members[1].departments[0].position" label="members[1].departments[0].position"></s:textfield>
        <s:textfield name="members[1].departments[0].createTime" label="members[1].departments[0].createTime"></s:textfield>

        <s:textfield name="members[1].departments[1].name" label="members[1].departments[1].name"></s:textfield>
        <s:textfield name="members[1].departments[1].position" label="members[1].departments[1].position"></s:textfield>
        <s:textfield name="members[1].departments[1].createTime" label="members[1].departments[1].createTime"></s:textfield>
        <s:submit label="提交"></s:submit>
    </s:form>
</body>
</html>

访问页面index.jsp

提交成功，后台打印信息

信息: At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
PointConverter's constructor...
2017-04-04 15:40:54,859 INFO  [localhost-startStop-1] log4j2.Log4j2Logger (Log4j2Logger.java:45) - Parsing configuration file [struts-default.xml]
。。。。。。
2017-04-04 15:40:54,936 INFO  [localhost-startStop-1] log4j2.Log4j2Logger (Log4j2Logger.java:45) - Choosing bean (struts) for (com.opensymphony.xwork2.security.AcceptedPatternsChecker)
PointConverter's constructor...
四月 04, 2017 3:40:55 下午 org.apache.catalina.startup.TldConfig execute
信息: At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
PointConverter's constructor...
2017-04-04 15:40:56,519 INFO  [localhost-startStop-1] log4j2.Log4j2Logger (Log4j2Logger.java:45) - Parsing configuration file [struts-default.xml]
。。。。。。
2017-04-04 15:40:56,625 INFO  [localhost-startStop-1] log4j2.Log4j2Logger (Log4j2Logger.java:45) - Choosing bean (struts) for (com.opensymphony.xwork2.security.AcceptedPatternsChecker)
PointConverter's constructor...
四月 04, 2017 3:40:56 下午 org.apache.catalina.startup.HostConfig deployDirectory
信息: Deploying web application directory D:\Work\Java\apache-tomcat-7.0.75-windows-x64\apache-tomcat-7.0.75\webapps\docs
。。。。。。
信息: Server startup in 9584 ms
四月 04, 2017 3:41:01 下午 org.apache.jasper.compiler.TldLocationsCache tldScanJar
信息: At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
2017-04-04 15:41:02,939 WARN  [http-bio-8080-exec-4] log4j2.Log4j2Logger (Log4j2Logger.java:57) - No configuration found for the specified action: 'abstractPropertyAction' in namespace: ''. Form action defaulting to 'action' attribute's literal value.
2017-04-04 15:41:03,230 WARN  [http-bio-8080-exec-4] log4j2.Log4j2Logger (Log4j2Logger.java:57) - No configuration found for the specified action: 'abstractPropertyAction' in namespace: ''. Form action defaulting to 'action' attribute's literal value.
convertFromString...
convertFromString...
convertFromString...
convertFromString...
[Member [id=null, name=12, 
           departments=[
                        Department [name=121, position=java.awt.Point[x=1,y=2], createTime=Tue Apr 04 15:41:01 CST 2017], 
                        Department [name=122, position=java.awt.Point[x=2,y=3], createTime=Tue Apr 04 15:41:02 CST 2017]
                       ]
       ], 
Member [id=null, name=121, 
           departments=[
                        Department [name=1211, position=java.awt.Point[x=11,y=21], createTime=Tue Apr 04 15:41:11 CST 2017], 
                        Department [name=1221, position=java.awt.Point[x=21,y=31], createTime=Tue Apr 04 15:41:12 CST 2017]
                       ]
       ]
]