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ajax传输的json，gson会发生丢失，long > 15的时候会丢失0
解决方案：直接把属性为long的属性自动加上双引号成为js的字符串，这样就不会发生丢失了，ajax自动识别为字符串。
用法：
ajaxresult("",0,new object()); //随便一个对象就可以，list 之类的
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/**
* 以ajax方式输出常规操作结果
*
* @param status
* 返回状态，200表示成功, 500表示错误
* @param message
* 操作结果描述
* @param tag
* 附加数据
* @return
*/
protected actionresult ajaxresult(int status, final string message, object tag) {
jsonobject json = new jsonobject();
json.addproperty("status", status);
json.addproperty("message", message);
string strjson = json.tostring();
if (tag != null) {
stringbuffer sb = new stringbuffer();
sb.append(strjson.substring(0, strjson.length() - 1));
sb.append(",\"tag\":");
sb.append(gsonutils.tojsonwithgson(tag));
sb.append("}");
strjson = sb.tostring();
}
return writejson(strjson);
}
/**
* 向客户端输出文本信息
*
* @param message
* @return
*/
protected actionresult write(final string message) {
return new actionresult() {
@override
public void render(beatcontext arg0) throws exception {
beat.getresponse().setcharacterencoding("utf-8");
beat.getresponse().setcontenttype("text/json;charset=utf-8");
printwriter out = beat.getresponse().getwriter();
out.print(message);
out.close();
}
};
}
/**
* 向客户端输出文本信息
*
* @param message
* @return
*/
protected actionresult writetext(final string message) {
return new actionresult() {
@override
public void render(beatcontext arg0) throws exception {
beat.getresponse().setcharacterencoding("utf-8");
beat.getresponse().setcontenttype("application/text");
printwriter out = beat.getresponse().getwriter();
out.print(message);
out.close();
}
};
}
gsonutils.java
package com.xxx.xxx.common.util.gson;
import com.google.gson.*;
import java.lang.reflect.type;
import java.util.arraylist;
import java.util.list;
import java.util.map;
public class gsonutils {
//private static log logger = logfactory.getlog(gsonutils.class);
public static string tojsonwithgson(object obj) {
gson gson = creategson(); //new gson();
return gson.tojson(obj);
}
public static string tojsonwithgson(object obj, type type) {
gson gson = creategson(); //new gson();
return gson.tojson(obj, type);
}
@suppresswarnings("unchecked")
public static string tojsonwithgson(list list) {
gson gson = creategson(); //new gson();
return gson.tojson(list);
}
@suppresswarnings("unchecked")
public static string tojsonwithgson(list list, type type) {
gson gson = creategson(); //new gson();
return gson.tojson(list, type);
}
public static string tojsonwithgsonbuilder(object obj) {
gson gson = new gsonbuilder().setexclusionstrategies(new myexclusionstrategy()).serializenulls().create();
return gson.tojson(obj);
}
public static string tojsonwithgsonbuilder(object obj, type type) {
gson gson = new gsonbuilder().setexclusionstrategies(new myexclusionstrategy()).serializenulls().create();
return gson.tojson(obj, type);
}
@suppresswarnings("unchecked")
public static string tojsonwithgsonbuilder(list list) {
gson gson = new gsonbuilder().setexclusionstrategies(new myexclusionstrategy()).serializenulls().create();
return gson.tojson(list);
}
@suppresswarnings("unchecked")
public static string tojsonwithgsonbuilder(list list, type type) {
gson gson = new gsonbuilder().setexclusionstrategies(new myexclusionstrategy()).serializenulls().create();
return gson.tojson(list, type);
}
public static <t> object fromjson(string json, class<t> clazz) {
object obj = null;
try {
gson gson = new gson();
obj = gson.fromjson(json, clazz);
} catch (exception e) {
//logger.error("fromjson方法转换json串到实体类出错", e);
}
return obj;
}
/**
* 如果 long 的数字超过15位，转换为string，在json中数字两边有引号
* @return
*/
private static gson creategson(){
gsonbuilder gsonbuilder = new gsonbuilder();
longserializer serializer = new longserializer();
gsonbuilder.registertypeadapter(long.class, serializer);
gsonbuilder.registertypeadapter(long.class, serializer);
gson gson = gsonbuilder.create();
return gson;
}
public static void main(string... args) throws exception{
// long a = 12345678901234578l;
//
// gsonbuilder builder = new gsonbuilder();
// builder.registertypeadapter(long.class, new longserializer());
// gson gson2 = builder.create();
// system.out.println(gson2.tojson(a));
//
// gson gson = new gsonbuilder().setexclusionstrategies(new myexclusionstrategy()).serializenulls().create();
// string str = gson.tojson(a);
// system.out.println(str);
testvo vo = new testvo();
vo.setid(618708732263538688l);
vo.setid2(918708732263538688l);
system.out.println(tojsonwithgson(vo));
}
static class longserializer implements jsonserializer<long> {
public jsonelement serialize(long src, type typeofsrc, jsonserializationcontext context) {
if(src!=null){
string strsrc = src.tostring();
if(strsrc.length()>15){
return new jsonprimitive(strsrc);
}
}
return new jsonprimitive(src);
}
}
static class testvo {
public long getid() {
return id;
}
public void setid(long id) {
this.id = id;
}
private long id;
public long getid2() {
return id2;
}
public void setid2(long id2) {
this.id2 = id2;
}
private long id2;
}
}
myexclusionstrategy.java
package com.xxx.xxx.common.util.gson;
import com.google.gson.exclusionstrategy;
import com.google.gson.fieldattributes;
public class myexclusionstrategy implements exclusionstrategy {
private final class<?> typetoskip;
public myexclusionstrategy(){
this.typetoskip=null;
}
public myexclusionstrategy(class<?> typetoskip) {
this.typetoskip = typetoskip;
}
public boolean shouldskipclass(class<?> clazz) {
return (clazz == typetoskip);
}
public boolean shouldskipfield(fieldattributes f) {
return f.getannotation(notserialize.class) != null;
}
}
notserialize
package com.xxx.xxx.common.util.gson;
import java.lang.annotation.elementtype;
import java.lang.annotation.retention;
import java.lang.annotation.retentionpolicy;
import java.lang.annotation.target;
@retention(retentionpolicy.runtime)
@target({elementtype.field})
public @interface notserialize {
}
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