jackson工具類

vqfq6057 10年前發布 | 2K 次閱讀 Java BI，商業智能，Power-BI

jackson工具類
沒有閉門造車.解決了lazyload的問題

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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\" : \"組織結構模板.xls\", \"sheet\" : [ { \"entryCode\" : \"epdm_pcOrganizationT\", \"columns\" : [ { \"field\" : \"orgName\", \"title\" : \"機構名稱\" }, { \"field\" : \"orgCode\", \"title\" : \"機構代碼\" }, { \"field\" : \"canton\", \"title\" : \"行政區名稱\" }, { \"field\" : \"cantonCode\", \"title\" : \"行政區代碼\" }, { \"field\" : \"mailingAddress\", \"title\" : \"郵遞地址\" }, { \"field\" : \"orgId\", \"title\" : \"ORG_ID\" }, { \"field\" : \"orgLevel\", \"title\" : \"級別\" }, { \"field\" : \"parentId\", \"title\" : \"上級機構名稱\" } ], \"sheetName\" : \"Sheet1\", \"rows\" : [ { \"\" : \"\", \"orgId\" : \"444.0\", \"parentId\" : \"雍和宮\", \"cantonCode\" : \"7777.0\", \"orgCode\" : \"9999.0\", \"canton\" : \"石景山\", \"orgName\" : \"八角\", \"mailingAddress\" : \"102300.0\", \"orgLevel\" : \"中級\" }, { \"\" : \"\", \"orgId\" : \"444.0\", \"parentId\" : \"雍和宮\", \"cantonCode\" : \"7777.0\", \"orgCode\" : \"10000.0\", \"canton\" : \"石景山\", \"orgName\" : \"八角\", \"mailingAddress\" : \"102300.0\", \"orgLevel\" : \"中級\" }, { \"\" : \"\", \"orgId\" : \"444.0\", \"parentId\" : \"雍和宮\", \"cantonCode\" : \"7777.0\", \"orgCode\" : \"10001.0\", \"canton\" : \"石景山\", \"orgName\" : \"八角\", \"mailingAddress\" : \"102300.0\", \"orgLevel\" : \"中級\" }, { \"\" : \"\", \"orgId\" : \"444.0\", \"parentId\" : \"雍和宮\", \"cantonCode\" : \"7777.0\", \"orgCode\" : \"10002.0\", \"canton\" : \"石景山\", \"orgName\" : \"八角\", \"mailingAddress\" : \"102300.0\", \"orgLevel\" : \"中級\" } ] }, { \"entryCode\" : \"epdm_pcOrganizationT\", \"columns\" : [ { \"field\" : \"orgName\", \"title\" : \"機構名稱\" }, { \"field\" : \"orgCode\", \"title\" : \"機構代碼\" }, { \"field\" : \"canton\", \"title\" : \"行政區名稱\" }, { \"field\" : \"cantonCode\", \"title\" : \"行政區代碼\" }, { \"field\" : \"mailingAddress\", \"title\" : \"郵遞地址\" }, { \"field\" : \"orgId\", \"title\" : \"ORG_ID\" }, { \"field\" : \"orgLevel\", \"title\" : \"級別\" }, { \"field\" : \"parentId\", \"title\" : \"上級機構名稱\" } ], \"sheetName\" : \"Sheet2\", \"rows\" : [ { \"\" : \"\", \"orgId\" : \"444.0\", \"parentId\" : \"雍和宮\", \"cantonCode\" : \"7777.0\", \"orgCode\" : \"888.0\", \"canton\" : \"石景山\", \"orgName\" : \"八角\", \"mailingAddress\" : \"102300.0\", \"orgLevel\" : \"中級\" }, { \"\" : \"\", \"orgId\" : \"444.0\", \"parentId\" : \"雍和宮\", \"cantonCode\" : \"7777.0\", \"orgCode\" : \"889.0\", \"canton\" : \"石景山\", \"orgName\" : \"八角\", \"mailingAddress\" : \"102300.0\", \"orgLevel\" : \"中級\" }, { \"\" : \"\", \"orgId\" : \"444.0\", \"parentId\" : \"雍和宮\", \"cantonCode\" : \"7777.0\", \"orgCode\" : \"890.0\", \"canton\" : \"石景山\", \"orgName\" : \"八角\", \"mailingAddress\" : \"102300.0\", \"orgLevel\" : \"中級\" }, { \"\" : \"\", \"orgId\" : \"444.0\", \"parentId\" : \"雍和宮\", \"cantonCode\" : \"7777.0\", \"orgCode\" : \"891.0\", \"canton\" : \"石景山\", \"orgName\" : \"八角\", \"mailingAddress\" : \"102300.0\", \"orgLevel\" : \"中級\" } ] } ] }";

    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;
  }
}

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Java BI，商業智能，Power-BI

jackson工具類

JpaLazyIntrospector.java

JsonLazy.java

JsonUtil.java ~ 9KB

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