jackson工具类详解编程语言

JpaLazyIntrospector.java      

package com.rf.dtd.systemsupport.reportmodel.Util; 
 
import java.lang.annotation.Annotation; 
import javax.persistence.Basic; 
import javax.persistence.ElementCollection; 
import javax.persistence.FetchType; 
import javax.persistence.ManyToMany; 
import javax.persistence.ManyToOne; 
import javax.persistence.OneToMany; 
import javax.persistence.OneToOne; 
import org.codehaus.jackson.map.introspect.Annotated; 
import org.codehaus.jackson.map.introspect.JacksonAnnotationIntrospector; 
 
class JpaLazyIntrospector extends JacksonAnnotationIntrospector 
{ 
  public boolean isHandled(Annotation ann) 
  { 
    boolean handled = super.isHandled(ann); 
    if (!handled) { 
      handled = ann.toString().startsWith("@javax.persistence"); 
    } 
    if (!handled) { 
      handled = ann.annotationType().equals(JsonLazy.class); 
    } 
    return handled; 
  } 
 
  protected boolean _isIgnorable(Annotated a) 
  { 
    boolean ignor = super._isIgnorable(a); 
    if (!ignor) { 
      ignor = isLazy(a); 
    } 
    return ignor; 
  } 
 
  private boolean isLazy(Annotated a) { 
    boolean lazy = false; 
 
    JsonLazy jsonLazy = (JsonLazy)a.getAnnotation(JsonLazy.class); 
    if (jsonLazy != null) { 
      return false; 
    } 
 
    Basic basic = (Basic)a.getAnnotation(Basic.class); 
    if ((basic != null) && (basic.fetch() == FetchType.LAZY)) { 
      lazy = true; 
    } 
 
    ElementCollection elementCollection = (ElementCollection)a.getAnnotation(ElementCollection.class); 
    if ((elementCollection != null) && (elementCollection.fetch() != FetchType.EAGER)) { 
      lazy = true; 
    } 
 
    ManyToMany manyToMany = (ManyToMany)a.getAnnotation(ManyToMany.class); 
    if ((manyToMany != null) && (manyToMany.fetch() != FetchType.EAGER)) { 
      lazy = true; 
    } 
 
    OneToMany oneToMany = (OneToMany)a.getAnnotation(OneToMany.class); 
    if ((oneToMany != null) && (oneToMany.fetch() != FetchType.EAGER)) { 
      lazy = true; 
    } 
 
    ManyToOne manyToOne = (ManyToOne)a.getAnnotation(ManyToOne.class); 
    if ((manyToOne != null) && (manyToOne.fetch() == FetchType.LAZY)) { 
      lazy = true; 
    } 
 
    OneToOne oneToOne = (OneToOne)a.getAnnotation(OneToOne.class); 
    if ((oneToOne != null) && (oneToOne.fetch() == FetchType.LAZY)) { 
      lazy = true; 
    } 
    return lazy; 
  } 
}

JsonLazy.java 

package com.rf.dtd.systemsupport.reportmodel.Util; 
 
import java.lang.annotation.Retention; 
import java.lang.annotation.RetentionPolicy; 
import java.lang.annotation.Target; 
 
@Target({java.lang.annotation.ElementType.METHOD, java.lang.annotation.ElementType.FIELD}) 
@Retention(RetentionPolicy.RUNTIME) 
public @interface JsonLazy 
{ 
  public abstract boolean value(); 
}

JsonUtil.java ~ 9KB         

package com.rf.dtd.systemsupport.reportmodel.Util; 
import java.io.BufferedReader; 
import java.io.File; 
import java.io.FileReader; 
import java.io.IOException; 
import java.io.Writer; 
import java.text.SimpleDateFormat; 
import java.util.ArrayList; 
import java.util.Iterator; 
import java.util.LinkedHashMap; 
import java.util.List; 
import java.util.Map; 
import org.codehaus.jackson.JsonNode; 
import org.codehaus.jackson.JsonParser; 
import org.codehaus.jackson.map.DeserializationConfig; 
import org.codehaus.jackson.map.ObjectMapper; 
import org.codehaus.jackson.map.SerializationConfig; 
import org.codehaus.jackson.node.TextNode; 
import org.codehaus.jackson.type.TypeReference; 
public abstract class JsonUtil 
{ 
public static void main(String[] args) 
{ 
Object ss = parseJson("{/"datasourceId/":12201,/"dsName/":/"bj/",/"jndiName/":/"/",/"driverClass/":/"oracle.jdbc.OracleDriver/",/"jdbcURL/":/"jdbc:oracle:thin:@10.88.107.250:1521:orcl/",/"userName/":/"devtest/",/"password/":/"devtest/"}"); 
String josnString = "{ /"excelName/" : /"组织结构模板.xls/", /"sheet/" : [ { /"entryCode/" : /"epdm_pcOrganizationT/", /"columns/" : [ { /"field/" : /"orgName/", /"title/" : /"机构名称/" }, { /"field/" : /"orgCode/", /"title/" : /"机构代码/" }, { /"field/" : /"canton/", /"title/" : /"行政区名称/" }, { /"field/" : /"cantonCode/", /"title/" : /"行政区代码/" }, { /"field/" : /"mailingAddress/", /"title/" : /"邮递地址/" }, { /"field/" : /"orgId/", /"title/" : /"ORG_ID/" }, { /"field/" : /"orgLevel/", /"title/" : /"级别/" }, { /"field/" : /"parentId/", /"title/" : /"上级机构名称/" } ], /"sheetName/" : /"Sheet1/", /"rows/" : [ { /"/" : /"/", /"orgId/" : /"444.0/", /"parentId/" : /"雍和宫/", /"cantonCode/" : /"7777.0/", /"orgCode/" : /"9999.0/", /"canton/" : /"石景山/", /"orgName/" : /"八角/", /"mailingAddress/" : /"102300.0/", /"orgLevel/" : /"中级/" }, { /"/" : /"/", /"orgId/" : /"444.0/", /"parentId/" : /"雍和宫/", /"cantonCode/" : /"7777.0/", /"orgCode/" : /"10000.0/", /"canton/" : /"石景山/", /"orgName/" : /"八角/", /"mailingAddress/" : /"102300.0/", /"orgLevel/" : /"中级/" }, { /"/" : /"/", /"orgId/" : /"444.0/", /"parentId/" : /"雍和宫/", /"cantonCode/" : /"7777.0/", /"orgCode/" : /"10001.0/", /"canton/" : /"石景山/", /"orgName/" : /"八角/", /"mailingAddress/" : /"102300.0/", /"orgLevel/" : /"中级/" }, { /"/" : /"/", /"orgId/" : /"444.0/", /"parentId/" : /"雍和宫/", /"cantonCode/" : /"7777.0/", /"orgCode/" : /"10002.0/", /"canton/" : /"石景山/", /"orgName/" : /"八角/", /"mailingAddress/" : /"102300.0/", /"orgLevel/" : /"中级/" } ] }, { /"entryCode/" : /"epdm_pcOrganizationT/", /"columns/" : [ { /"field/" : /"orgName/", /"title/" : /"机构名称/" }, { /"field/" : /"orgCode/", /"title/" : /"机构代码/" }, { /"field/" : /"canton/", /"title/" : /"行政区名称/" }, { /"field/" : /"cantonCode/", /"title/" : /"行政区代码/" }, { /"field/" : /"mailingAddress/", /"title/" : /"邮递地址/" }, { /"field/" : /"orgId/", /"title/" : /"ORG_ID/" }, { /"field/" : /"orgLevel/", /"title/" : /"级别/" }, { /"field/" : /"parentId/", /"title/" : /"上级机构名称/" } ], /"sheetName/" : /"Sheet2/", /"rows/" : [ { /"/" : /"/", /"orgId/" : /"444.0/", /"parentId/" : /"雍和宫/", /"cantonCode/" : /"7777.0/", /"orgCode/" : /"888.0/", /"canton/" : /"石景山/", /"orgName/" : /"八角/", /"mailingAddress/" : /"102300.0/", /"orgLevel/" : /"中级/" }, { /"/" : /"/", /"orgId/" : /"444.0/", /"parentId/" : /"雍和宫/", /"cantonCode/" : /"7777.0/", /"orgCode/" : /"889.0/", /"canton/" : /"石景山/", /"orgName/" : /"八角/", /"mailingAddress/" : /"102300.0/", /"orgLevel/" : /"中级/" }, { /"/" : /"/", /"orgId/" : /"444.0/", /"parentId/" : /"雍和宫/", /"cantonCode/" : /"7777.0/", /"orgCode/" : /"890.0/", /"canton/" : /"石景山/", /"orgName/" : /"八角/", /"mailingAddress/" : /"102300.0/", /"orgLevel/" : /"中级/" }, { /"/" : /"/", /"orgId/" : /"444.0/", /"parentId/" : /"雍和宫/", /"cantonCode/" : /"7777.0/", /"orgCode/" : /"891.0/", /"canton/" : /"石景山/", /"orgName/" : /"八角/", /"mailingAddress/" : /"102300.0/", /"orgLevel/" : /"中级/" } ] } ] }"; 
Object sssw = parseJson(josnString); 
System.out.println(sssw); 
System.out.println(ss); 
} 
public static String getJSONString(String filePath) throws Exception{ 
StringBuffer data = new StringBuffer(); 
BufferedReader reader = null; 
reader = new BufferedReader(new FileReader(new File(filePath))); 
String temp = null; 
while((temp = reader.readLine()) != null){ 
data.append(temp); 
} 
if (reader != null){ 
reader.close(); 
} 
return data.toString(); 
} 
public static ObjectMapper getObjectMapper() { 
ObjectMapper om = new ObjectMapper().setAnnotationIntrospector(new JpaLazyIntrospector()); 
om.setDateFormat(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss")); 
om.configure(SerializationConfig.Feature.INDENT_OUTPUT, true); 
om.configure(SerializationConfig.Feature.FAIL_ON_EMPTY_BEANS, false); 
om.configure(DeserializationConfig.Feature.FAIL_ON_UNKNOWN_PROPERTIES, false); 
om.configure(DeserializationConfig.Feature.FAIL_ON_NULL_FOR_PRIMITIVES, false); 
om.configure(DeserializationConfig.Feature.FAIL_ON_NUMBERS_FOR_ENUMS, false); 
om.configure(DeserializationConfig.Feature.ACCEPT_SINGLE_VALUE_AS_ARRAY, true); 
om.configure(DeserializationConfig.Feature.ACCEPT_EMPTY_STRING_AS_NULL_OBJECT, true); 
om.configure(JsonParser.Feature.ALLOW_UNQUOTED_FIELD_NAMES, true); 
return om; 
} 
public static String toJsonString(Object object) 
{ 
try 
{ 
return getObjectMapper().writeValueAsString(object); 
} catch (IOException ex) { 
throw new RuntimeException(ex); 
} 
} 
public static void writeJsonString(Object object, Writer writer) 
{ 
try 
{ 
getObjectMapper().writeValue(writer, object); 
} catch (IOException ex) { 
throw new RuntimeException(ex); 
} 
} 
public static Map<?, ?> parseJson(String jsonString) 
{ 
JsonNode jn = null; 
try { 
jn = getObjectMapper().readTree(jsonString); 
} catch (IOException ex) { 
ex.printStackTrace(); 
} 
return (Map<?, ?>)JsonNodeToMap(jn); 
} 
public static Object parseJson2MapOrList(String jsonString) 
{ 
JsonNode jn = null; 
try { 
jn = getObjectMapper().readTree(jsonString); 
} catch (IOException ex) { 
ex.printStackTrace(); 
} 
return JsonNodeToMap(jn); 
} 
public static <T> T parseJson(String jsonString, Class<T> classType) 
{ 
try { 
return getObjectMapper().readValue(jsonString, classType); 
} catch (Exception ex) { 
ex.printStackTrace(); 
}return null; 
} 
public static <T> T parseJson(String jsonString, TypeReference<T> typeReference) 
{ 
try 
{ 
return getObjectMapper().readValue(jsonString, typeReference); 
} catch (Exception ex) { 
ex.printStackTrace(); 
}return null; 
} 
public static <T> T parseJsonT(String jsonString) 
{ 
try 
{ 
return getObjectMapper().readValue(jsonString, new TypeReference<Object>() { } ); 
} 
catch (Exception ex) { 
ex.printStackTrace(); 
}return null; 
} 
public static <T> Map<?, ?> bean2Map(Object bean) 
{ 
try 
{ 
return (Map<?, ?>)getObjectMapper().convertValue(bean, Map.class); 
} catch (Exception ex) { 
ex.printStackTrace(); 
}return null; 
} 
public static <T> T map2Bean(Map<?, ?> map, Class<T> clazz) 
{ 
try 
{ 
return getObjectMapper().convertValue(map, clazz); 
} catch (Exception ex) { 
ex.printStackTrace(); 
}return null; 
} 
public static Object JsonNodeToMap(JsonNode root) 
{ 
Map<String, Object> map = new LinkedHashMap<String, Object>(); 
if (root == null) { 
return map; 
} 
if (root.isArray()) { 
List<Object> list = new ArrayList<Object>(); 
for (JsonNode node : root) { 
Object nmp = JsonNodeToMap(node); 
list.add(nmp); 
} 
return list; 
}if (root.isTextual()) { 
try { 
return ((TextNode)root).asText(); 
} catch (Exception e) { 
return root.toString(); 
} 
} 
Iterator<?> iter = root.getFields(); 
while (iter.hasNext()) { 
@SuppressWarnings("rawtypes") 
Map.Entry entry = (Map.Entry)iter.next(); 
String key = (String)entry.getKey(); 
JsonNode ele = (JsonNode)entry.getValue(); 
if (ele.isObject()) 
map.put(key, JsonNodeToMap(ele)); 
else if (ele.isTextual()) 
map.put(key, ((TextNode)ele).asText()); 
else if (ele.isArray()) 
map.put(key, JsonNodeToMap(ele)); 
else { 
map.put(key, ele.toString()); 
} 
} 
return map; 
} 
}