Java代码实现Map和Object互转及Map和Json互转

先给大家介绍下map和object互相转换的代码。

具体代码如所示：

/** 
* 使用org.apache.commons.beanutils进行转换 
*/ 
class a { 
public static object maptoobject(map<string, object> map, class<?> beanclass) throws exception { 
if (map == null) 
return null; 
object obj = beanclass.newinstance(); 
org.apache.commons.beanutils.beanutils.populate(obj, map); 
return obj; 
} 
public static map<?, ?> objecttomap(object obj) { 
if(obj == null) 
return null; 
return new org.apache.commons.beanutils.beanmap(obj); 
} 
} 
/** 
* 使用introspector进行转换 
*/ 
class b { 
public static object maptoobject(map<string, object> map, class<?> beanclass) throws exception { 
if (map == null) 
return null; 
object obj = beanclass.newinstance(); 
beaninfo beaninfo = introspector.getbeaninfo(obj.getclass()); 
propertydescriptor[] propertydescriptors = beaninfo.getpropertydescriptors(); 
for (propertydescriptor property : propertydescriptors) { 
method setter = property.getwritemethod(); 
if (setter != null) { 
setter.invoke(obj, map.get(property.getname())); 
} 
} 
return obj; 
} 
public static map<string, object> objecttomap(object obj) throws exception { 
if(obj == null) 
return null; 
map<string, object> map = new hashmap<string, object>(); 
beaninfo beaninfo = introspector.getbeaninfo(obj.getclass()); 
propertydescriptor[] propertydescriptors = beaninfo.getpropertydescriptors(); 
for (propertydescriptor property : propertydescriptors) { 
string key = property.getname(); 
if (key.comparetoignorecase("class") == 0) { 
continue; 
} 
method getter = property.getreadmethod(); 
object value = getter!=null ? getter.invoke(obj) : null; 
map.put(key, value); 
} 
return map; 
} 
} 
/** 
* 使用reflect进行转换 
*/ 
class c { 
public static object maptoobject(map<string, object> map, class<?> beanclass) throws exception { 
if (map == null) 
return null; 
object obj = beanclass.newinstance(); 
field[] fields = obj.getclass().getdeclaredfields(); 
for (field field : fields) { 
int mod = field.getmodifiers(); 
if(modifier.isstatic(mod) || modifier.isfinal(mod)){ 
continue; 
} 
field.setaccessible(true); 
field.set(obj, map.get(field.getname())); 
} 
return obj; 
} 
public static map<string, object> objecttomap(object obj) throws exception { 
if(obj == null){ 
return null; 
} 
map<string, object> map = new hashmap<string, object>(); 
field[] declaredfields = obj.getclass().getdeclaredfields(); 
for (field field : declaredfields) { 
field.setaccessible(true); 
map.put(field.getname(), field.get(obj)); 
} 
return map; 
} 
<p>} </p><p> 
</p><p>from：http://www.open-open.com/code/view/1423280939826</p> 

下面给大家介绍map和json的互相转换

第一段代码

map<string,object> map = new hashmap<string,object>();
map.put("method","json");
map.put("param",null);
map.put("time","2015-01-23 10:54:55");
objectmapper mapper = new objectmapper();
mapper.writevalueasstring(map);

第二段代码

public static void readjson2map(string json) {
objectmapper objectmapper = new objectmapper();
try {
//将json字符串转成map结合解析出来，并打印(这里以解析成map为例)
map<string, map<string, object>> maps = objectmapper.readvalue(
json, map.class);
system.out.println(maps.size());
set<string> key = maps.keyset();
iterator<string> iter = key.iterator();
while (iter.hasnext()) {
string field = iter.next();
system.out.println(field + ":" + maps.get(field));
}
} catch (jsonparseexception e) {
e.printstacktrace();
} catch (jsonmappingexception e) {
e.printstacktrace();
} catch (ioexception e) {
e.printstacktrace();
}
}
readjson2map(json);

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