在jfinal的Controller中接受json数据

JFinal中接收URL中的参数或者model中的参数是很方便的,但是对于web2.0的网站来说,经常会以json方式提交比较复杂的数据,比如一个查询,包含了各种过滤条件和排序分页,前端脚本可能提交的数据是这样的: 

{
	"type":1,
	"key":"keyword",
	"paging":{
		"size":50,
		"index":0
	},
	"sort":{
		"field":"time",
		"type":"desc"
	}
}

像SpringMVC就提供了@RequestBody将数据绑定到json对象上,但是jFinal不支持,需要自己从POST中读取并解析这个json数据,先定义一个与请求同结构的Java对象,比如起名叫QueryRequest:

packagecom.demo;
import com.demo.Paging;
import com.demo.Sort;
public class QueryRequest {
	private int type;
	private String key;
	private Paging paging;
	private Sort sort;
	public int getType() {
		return type;
	}
	public void setType(int type) {
		this.type = type;
	}
	public String getKey() {
		return key;
	}
	public void setKey(String key) {
		this.key = key;
	}
	public Paging getPaging() {
		return paging;
	}
	public void setPaging(Paging paging) {
		this.paging = paging;
	}
	public Sort getSort(){
		return sort;
	}
	public void setSort(Sort sort){
		this.sort = sort;
	}
}

其中用到了Paging和Sort两个类:

package com.demo;
public class Paging {
	private int size;
	private int index;
	public int getSize() {
		return size;
	}
	public void setSize(int size) {
		this.size = size;
	}
	public int getIndex() {
		return index;
	}
	public void setIndex(int index) {
		this.index = index;
	}
}
package com.demo;
public class Sort {
	private String field;
	private String type;
	public String getField() {
		return field;
	}
	public void setField(String field) {
		this.field = field;
	}
	public String getType() {
		return type;
	}
	public void setType(String type) {
		this.type = type;
	}
}

然后在Controller里就从request中读取json字符串,然后调用fastjson解析提交的数据了,:

@Before(POST.class)
public void getData(){
	try{
		//从requst中读取json字符串
		StringBuilder json = new StringBuilder(); 
		BufferedReader reader = this.getRequest().getReader();
		String line = null;
		while((line = reader.readLine()) != null){
			json.append(line);
		}
		reader.close();
		//调用fastjson解析出对象
		QueryRequest request = JSONObject.parseObject(json.toString(), QueryRequest.class);
		//然后就可以使用request得到请求的所有数据了
		//下略
		//.......
	}
	catch(Exception ex){
		//异常处理,略
	}
	renderText("测试");
}

转换部分会经常使用,可以提出来:

/**
 * 取Request中的数据对象
 * @param valueType
 * @return
 * @throws Exception 
 */
protected <T> T getRequestObject(Class<T> valueType) throws Exception {
	StringBuilder json = new StringBuilder();
	BufferedReader reader = this.getRequest().getReader();
	String line = null;
	while((line = reader.readLine()) != null){
		json.append(line);
	}
	reader.close();
	return JSONObject.parseObject(json.toString(), valueType);
}

使用的时候一句就行了:

QueryRequest requst = getRequestObject(QueryRequest.class);

另外附上前端ajax调用的脚本:

$.ajax({
	"url": "/home/getDate",	  //路径
	"cache": false,			  //不缓存
	"async": true,			   //异步
	"type": "POST",			  //POST方式提交
	"dataType": "json",		  //json格式,重要
	"contentType": "application/json",	  //json格式
	"data": {},				  //要提交的数据对象
	success: function (json) { //成功处理
	},
	error: function (x, e) {  //异常处理
	}
});
posted @ 2016-10-19 11:19  剑客族长  阅读(2539)  评论(0编辑  收藏  举报