jackson工具类，,jackson工具类没有

jackson工具类，,jackson工具类没有

jackson工具类没有闭门造车.解决了lazyload的问题

JpaLazyIntrospector.java ``` javapackage 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 javapackage 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 javapackage 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; }}```