关于String Json 与其他类型数据转换的总结:
一:关于自己遇到的坑:
跨域请求获取到 string json(gson处理) 数据后处理转换为实体类进行存储:
跨域 return gson.tojson(map);
通过http等方法获取请求结果为 stringbuffer (此过程不加赘述,自行baidu),
处理 结果 buffer(test测试):
test中list 数据格式:
[
{"filesystem":"/dev/mapper/vg_gsbwapp1-lv_root","size":"485g","used":"60g","avail":"401g","usep":"13%","mountedon":"/","ipid":1},
{"filesystem":"tmpfs","size":"7.7g","used":"72k","avail":"7.7g","usep":"1%","mountedon":"/dev/shm","ipid":1},
{"filesystem":"/dev/sda2","size":"485m","used":"39m","avail":"421m","usep":"9%","mountedon":"/boot","ipid":1},
{"filesystem":"/dev/sda1","size":"200m","used":"260k","avail":"200m","usep":"1%","mountedon":"/boot/efi","ipid":1},
{"filesystem":"/dev/mapper/vg_gsbwapp1-lv_home","size":"49g","used":"2.6g","avail":"44g","usep":"6%","mountedon":"/home","ipid":1}
]
注意:
string retule = gson.tojson(disk_re.get(disk_i));
坑: string retule = disk_re.get(disk_i).tostring(); 此方法转换string类型之后字符串内部结构发生变化,使用 gson.fromjson(string json,t<class>)时出现异常
.tostring() 之后数据格式变为:
{filesystem=/dev/mapper/vg_gsbwapp1-lv_root,size=485g,used=60g,avail=401g,usep=13%,mountedon=/,ipid=1.0}
二: 总结gson转换用法
import com.google.gson.reflect.typetoken;
import java.util.list;
import java.util.map;
private static gson gson = null;
gson = new gson();
}
}
* 转成json
*/
public static string gsonstring(object object) {
string gsonstring = null;
if (gson != null) {
gsonstring = gson.tojson(object);
}
return gsonstring;
}
* 转成bean
*/
public static <t> t gsontobean(string gsonstring, class<t> cls) {
t t = null;
if (gson != null) {
t = gson.fromjson(gsonstring, cls);
}
return t;
}
* 转成list
*/
public static <t> list<t> gsontolist(string gsonstring, class<t> cls) {
list<t> list = null;
if (gson != null) {
list = gson.fromjson(gsonstring, new typetoken<list<t>>() {
}.gettype());
}
return list;
}
* 转成list中有map的
*/
public static <t> list<map<string, t>> gsontolistmaps(string gsonstring) {
list<map<string, t>> list = null;
if (gson != null) {
list = gson.fromjson(gsonstring,
new typetoken<list<map<string, t>>>() {
}.gettype());
}
return list;
}
* 转成map的
*/
public static <t> map<string, t> gsontomaps(string gsonstring) {
map<string, t> map = null;
if (gson != null) {
map = gson.fromjson(gsonstring, new typetoken<map<string, t>>() {
}.gettype());
}
return map;
}
object 转map
*/
static <t> object objecttomaps(object object) {
if (object == null) {
return null;
}
if (object instanceof integer || object instanceof string || object instanceof double ||
object instanceof float || object instanceof long || object instanceof boolean ||
object instanceof date || object instanceof list) {
return object;
}
/*if (object instanceof hibernateproxy) {
system.out.println("object instanceof hibernateproxy");
}
gson gson = new gsonbuilder()
.registertypeadapterfactory(hibernateproxytypeadapter.factory)
.create();*/
map<string, t> map = null;
map = gson.fromjson(gson.tojson(object), new typetoken<map<string, t>>() {
}.gettype());
return map;
}
}
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