struts2 返回json數據

原創

jationxiaozi

2020-02-22 06:07

本例使用struts2版本 struts-2.1.8.1

首先導入必要的jar包：

配置web.xml：

Xml代碼

<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>*.action</url-pattern>
</filter-mapping>

<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>*.action</url-pattern>
	</filter-mapping>

接着書寫Action類：

Java代碼

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import com.opensymphony.xwork2.Action;
public class Test {
public Map responseJson;
public Map getResponseJson() {
return responseJson;
}
public void setResponseJson(Map responseJson) {
this.responseJson = responseJson;
}
public String getList(){
Map<String, Object> map = new HashMap<String, Object>();
List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();
for(int i=0;i<3;i++){
Map<String, Object> m = new HashMap<String, Object>();
m.put("id", i);
m.put("name", "Mic"+i);
list.add(m);
}
map.put("rows", list);
map.put("totalCont", 3);
this.setResponseJson(map);
return Action.SUCCESS;
}
}

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import com.opensymphony.xwork2.Action;


public class Test {
	public Map responseJson;
	public Map getResponseJson() {
		return responseJson;
	}
	public void setResponseJson(Map responseJson) {
		this.responseJson = responseJson;
	}
	
	public String getList(){
		Map<String, Object> map = new HashMap<String, Object>();
		List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();
		for(int i=0;i<3;i++){
			Map<String, Object> m = new HashMap<String, Object>();
			m.put("id", i);
			m.put("name", "Mic"+i);
			list.add(m);
		}
		map.put("rows", list);
		map.put("totalCont", 3);
		this.setResponseJson(map);
		return Action.SUCCESS;
	}
}

最後配置struts.xml文件：

Xml代碼

<package name="jsonTest" extends="json-default">
<action name="test" class="bll.Test" method="getList">
<result type="json">
<param name="root">responseJson</param>
</result>
</action>
</package>

<package name="jsonTest" extends="json-default">
		<action name="test" class="bll.Test" method="getList">			
			<result type="json">
				<param name="root">responseJson</param>
			</result>
		</action>
	</package>

struts.xml配置說明：

1，<result type="json"> 這句說明返回類型爲json，所以extends設置爲"json-default"。

2，<param name="root">responseJson</param> responseJson對應返回數據的根，如果省略這行返回的結果如下：

Js代碼

{"list":"success","responseJson":{"rows":[{"name":"Mic0","id":0},{"name":"Mic1","id":1},{"name":"Mic2","id":2}],"totalCont":3}}

{"list":"success","responseJson":{"rows":[{"name":"Mic0","id":0},{"name":"Mic1","id":1},{"name":"Mic2","id":2}],"totalCont":3}}

如果設置了root，結果如下：

Js代碼

{"rows":[{"name":"Mic0","id":0},{"name":"Mic1","id":1},{"name":"Mic2","id":2}],"totalCont":3}

{"rows":[{"name":"Mic0","id":0},{"name":"Mic1","id":1},{"name":"Mic2","id":2}],"totalCont":3}

以上步驟做好後，我們就可以調用該action了：

Js代碼

Ext.onReady(function(){
new Mic.GridPanel({
title : 'test',
width : 500,
height : 410,
dataUrl : 'test.action',
dwrStore : false,
colMapping : ['id','name'],
headers : [
{ header: "Id", width: 60, dataIndex:'id'},
{ header: "名稱", width: 150, dataIndex:'name'}
]
}).render(Ext.getBody());
});

Ext.onReady(function(){
  		new Mic.GridPanel({
			title : 'test',
			width : 500,
			height : 410,
	        dataUrl : 'test.action',
	        dwrStore : false,
	        colMapping : ['id','name'],
			headers : [
				{ header: "Id", width: 60, dataIndex:'id'},
		        { header: "名稱", width: 150, dataIndex:'name'}
			]
		}).render(Ext.getBody());
  	});

調用說明： dataUrl : 'test.action' test就是action中的name屬性。

返回數據：