jackson工具类
没有闭门造车.解决了lazyload的问题 </div>

 

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;    }  }