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json的各种解析:
JSON(JavaScript Object Notation) 是一种轻量级的数据交换格式,相比较于xml交换数据的格式xml是重量级的数据交换格式。
json解析比较常用,因为他是一种轻量级的数据交换方式,下面就来实际操作下json的解析。
json可以将一个对象,数组,集合,map等转换为json格式的字符串。
反之也可以将正确的json格式字符串转换为对象,数组,集合,map等。
json在不提交表单,异步向浏览器传递一个对象,这时用json就比较方便,因为我们只需导入相应的架包,向浏览器输出一个json格式的字符串,相应的jar包会帮我们解析。在向浏览器输出json格式的字符串是要注意将编码改为国际通用的编码,否则解析出来会出现乱码。
解析json关键的类:
jackson 框架:这个框架提供了JsonGenerator ,ObjectMapper两个类通过这两个类提供的方法可以将java 对象转化为json 对象,json 数组格式,也可以将json对象、数组格式转化为java对象。
接下来直接上相关解析的代码:
相关测试的实体类:
BuyOrderDetail.java
1 package cn.hp.testjson; 2 3 import java.io.Serializable; 4 import java.math.BigDecimal; 5 6 7 public class BuyOrderDetail implements Serializable { 8 /** 9 * 10 */ 11 private static final long serialVersionUID = 6829722529150944502L; 12 13 private String bodId; 14 15 private String goodsId; 16 17 private String goodsName; 18 19 private String goodsUint; 20 21 @Override 22 public String toString() { 23 return "BuyOrderDetail [bodId=" + bodId + ", goodsId=" + goodsId 24 + ", goodsName=" + goodsName + ", goodsUint=" + goodsUint 25 + ", goodsType=" + goodsType + ", goodsColor=" + goodsColor 26 + ", bodAmount=" + bodAmount + ", bodBuyPrice=" + bodBuyPrice 27 + ", bodTotalPrice=" + bodTotalPrice + ", boId=" + boId 28 + ", bodImeiList=" + bodImeiList + "]"; 29 } 30 31 private String goodsType; 32 33 private String goodsColor; 34 35 private Integer bodAmount; 36 37 private BigDecimal bodBuyPrice; 38 39 private BigDecimal bodTotalPrice; 40 41 private String boId; 42 43 private String bodImeiList; 44 45 public String getBodId() { 46 return bodId; 47 } 48 49 public void setBodId(String bodId) { 50 this.bodId = bodId == null ? null : bodId.trim(); 51 } 52 53 public String getGoodsId() { 54 return goodsId; 55 } 56 57 public void setGoodsId(String goodsId) { 58 this.goodsId = goodsId == null ? null : goodsId.trim(); 59 } 60 61 public String getGoodsName() { 62 return goodsName; 63 } 64 65 public void setGoodsName(String goodsName) { 66 this.goodsName = goodsName == null ? null : goodsName.trim(); 67 } 68 69 public String getGoodsUint() { 70 return goodsUint; 71 } 72 73 public void setGoodsUint(String goodsUint) { 74 this.goodsUint = goodsUint == null ? null : goodsUint.trim(); 75 } 76 77 public String getGoodsType() { 78 return goodsType; 79 } 80 81 public void setGoodsType(String goodsType) { 82 this.goodsType = goodsType == null ? null : goodsType.trim(); 83 } 84 85 public String getGoodsColor() { 86 return goodsColor; 87 } 88 89 public void setGoodsColor(String goodsColor) { 90 this.goodsColor = goodsColor == null ? null : goodsColor.trim(); 91 } 92 93 public Integer getBodAmount() { 94 return bodAmount; 95 } 96 97 public void setBodAmount(Integer bodAmount) { 98 this.bodAmount = bodAmount; 99 } 100 101 public BigDecimal getBodBuyPrice() { 102 return bodBuyPrice; 103 } 104 105 public void setBodBuyPrice(BigDecimal bodBuyPrice) { 106 this.bodBuyPrice = bodBuyPrice; 107 } 108 109 110 111 public BigDecimal getBodTotalPrice() { 112 return bodTotalPrice; 113 } 114 115 public void setBodTotalPrice(BigDecimal bodTotalPrice) { 116 this.bodTotalPrice = bodTotalPrice; 117 } 118 119 public String getBoId() { 120 return boId; 121 } 122 123 public void setBoId(String boId) { 124 this.boId = boId == null ? null : boId.trim(); 125 } 126 127 public String getBodImeiList() { 128 return bodImeiList; 129 } 130 131 public void setBodImeiList(String bodImeiList) { 132 this.bodImeiList = bodImeiList == null ? null : bodImeiList.trim(); 133 } 134 }
Birthday.java
1 package cn.hp.testjson; 2 3 public class Birthday { 4 private String birthday; 5 6 public Birthday(String birthday) { 7 super(); 8 this.birthday = birthday; 9 } 10 11 //getter、setter 12 13 public Birthday() {} 14 15 @Override 16 public String toString() { 17 return this.birthday; 18 } 19 }
AccountBean.java
1 package cn.hp.testjson; 2 3 public class AccountBean { 4 private int id; 5 private String name; 6 private String email; 7 private String address; 8 private Birthday birthday; 9 10 //getter、setter 11 12 @Override 13 public String toString() { 14 return this.name + "#" + this.id + "#" + this.address + "#" + this.birthday + "#" + this.email; 15 } 16 17 public int getId() { 18 return id; 19 } 20 21 public void setId(int id) { 22 this.id = id; 23 } 24 25 public String getName() { 26 return name; 27 } 28 29 public void setName(String name) { 30 this.name = name; 31 } 32 33 public String getEmail() { 34 return email; 35 } 36 37 public void setEmail(String email) { 38 this.email = email; 39 } 40 41 public String getAddress() { 42 return address; 43 } 44 45 public void setAddress(String address) { 46 this.address = address; 47 } 48 49 public Birthday getBirthday() { 50 return birthday; 51 } 52 53 public void setBirthday(Birthday birthday) { 54 this.birthday = birthday; 55 } 56 }
主要用于测试json可以将一个对象,数组,集合,map等转换为json格式的字符串。
将正确的json格式字符串转换为对象,数组,集合,map等。
1 package cn.hp.testjson; 2 3 import java.io.IOException; 4 import java.util.ArrayList; 5 import java.util.HashMap; 6 import java.util.Iterator; 7 import java.util.LinkedHashMap; 8 import java.util.List; 9 import java.util.Map; 10 import java.util.Set; 11 12 import org.codehaus.jackson.JsonEncoding; 13 import org.codehaus.jackson.JsonGenerator; 14 import org.codehaus.jackson.JsonParseException; 15 import org.codehaus.jackson.map.JsonMappingException; 16 import org.codehaus.jackson.map.ObjectMapper; 17 import org.junit.After; 18 import org.junit.Before; 19 import org.junit.Test; 20 21 public class JacksonTest { 22 private JsonGenerator jsonGenerator = null; 23 private ObjectMapper objectMapper = null; 24 private AccountBean bean = null; 25 26 @Before 27 public void init() { 28 bean = new AccountBean(); 29 bean.setAddress("china-Guangzhou"); 30 bean.setEmail("hoojo_@126.com"); 31 bean.setId(1); 32 bean.setName("hoojo"); 33 34 objectMapper = new ObjectMapper(); 35 try { 36 jsonGenerator = objectMapper.getJsonFactory().createJsonGenerator( 37 System.out, JsonEncoding.UTF8); 38 } catch (IOException e) { 39 e.printStackTrace(); 40 } 41 } 42 43 @After 44 public void destory() { 45 try { 46 if (jsonGenerator != null) { 47 jsonGenerator.flush(); 48 } 49 if (!jsonGenerator.isClosed()) { 50 jsonGenerator.close(); 51 } 52 jsonGenerator = null; 53 objectMapper = null; 54 bean = null; 55 System.gc(); 56 } catch (IOException e) { 57 e.printStackTrace(); 58 } 59 } 60 61 /** 62 * <b>function:</b>将java对象转换成json字符串 63 */ 64 @Test 65 public void writeEntityJSON() { 66 67 try { 68 System.out.println("jsonGenerator"); 69 // writeObject可以转换java对象,eg:JavaBean/Map/List/Array等 70 jsonGenerator.writeObject(bean); 71 System.out.println(); 72 73 System.out.println("ObjectMapper"); 74 // writeValue具有和writeObject相同的功能 75 objectMapper.writeValue(System.out, bean); 76 77 } catch (IOException e) { 78 e.printStackTrace(); 79 } 80 } 81 82 /** 83 * <b>function:</b>将map转换成json字符串 84 */ 85 @Test 86 public void writeMapJSON() { 87 try { 88 Map<String, Object> map = new HashMap<String, Object>(); 89 map.put("name", bean.getName()); 90 map.put("account", bean); 91 bean = new AccountBean(); 92 bean.setAddress("china-Beijin"); 93 bean.setEmail("hoojo@qq.com"); 94 map.put("account2", bean); 95 96 System.out.println("jsonGenerator"); 97 jsonGenerator.writeObject(map); 98 System.out.println(""); 99 100 System.out.println("objectMapper"); 101 102 objectMapper.writeValue(System.out, map); 103 } catch (IOException e) { 104 e.printStackTrace(); 105 } 106 } 107 108 /** 109 * <b>function:</b>将list集合转换成json字符串 110 */ 111 @Test 112 public void writeListJSON() { 113 try { 114 List<AccountBean> list = new ArrayList<AccountBean>(); 115 list.add(bean); 116 117 bean = new AccountBean(); 118 bean.setId(2); 119 bean.setAddress("address2"); 120 bean.setEmail("email2"); 121 bean.setName("haha2"); 122 list.add(bean); 123 124 System.out.println("jsonGenerator"); 125 // list转换成JSON字符串 126 jsonGenerator.writeObject(list); 127 128 System.out.println(); 129 System.out.println("ObjectMapper"); 130 // 用objectMapper直接返回list转换成的JSON字符串 131 System.out.println("1###" + objectMapper.writeValueAsString(list)); 132 System.out.print("2###"); 133 // objectMapper list转换成JSON字符串 134 objectMapper.writeValue(System.out, list); 135 } catch (IOException e) { 136 e.printStackTrace(); 137 } 138 } 139 140 @Test 141 public void readJson2Entity() { 142 String json = "{\"address\":\"address\",\"name\":\"haha\",\"id\":1,\"email\":\"email\"}"; 143 try { 144 AccountBean acc = objectMapper.readValue(json, AccountBean.class); 145 System.out.println(acc.getName()); 146 System.out.println(acc); 147 } catch (JsonParseException e) { 148 e.printStackTrace(); 149 } catch (JsonMappingException e) { 150 e.printStackTrace(); 151 } catch (IOException e) { 152 e.printStackTrace(); 153 } 154 } 155 156 /** 157 * <b>function:</b>json字符串转换成list<map> 158 */ 159 @Test 160 public void readJson2List() { 161 String json = "[{\"address\": \"address2\",\"name\":\"haha2\",\"id\":2,\"email\":\"email2\"},{\"address\":\"address\",\"name\":\"haha\",\"id\":1,\"email\":\"email\"}]"; 162 try { 163 List<LinkedHashMap<String, Object>> list = objectMapper.readValue( 164 json, List.class); 165 System.out.println(list.size()); 166 for (int i = 0; i < list.size(); i++) { 167 Map<String, Object> map = list.get(i); 168 Set<String> set = map.keySet(); 169 for (Iterator<String> it = set.iterator(); it.hasNext();) { 170 String key = it.next(); 171 System.out.println(key + ":" + map.get(key)); 172 } 173 } 174 } catch (JsonParseException e) { 175 e.printStackTrace(); 176 } catch (JsonMappingException e) { 177 e.printStackTrace(); 178 } catch (IOException e) { 179 e.printStackTrace(); 180 } 181 } 182 183 /** 184 * <b>function:</b>json字符串转换成Array 185 * 186 */ 187 @Test 188 public void readJson2Array() { 189 String json = "[{\"address\": \"address2\",\"name\":\"haha2\",\"id\":2,\"email\":\"email2\"},{\"address\":\"address\",\"name\":\"haha\",\"id\":1,\"email\":\"email\"}]"; 190 try { 191 AccountBean[] arr = objectMapper.readValue(json, 192 AccountBean[].class); 193 System.out.println(arr.length); 194 for (int i = 0; i < arr.length; i++) { 195 System.out.println(arr[i]); 196 } 197 198 } catch (JsonParseException e) { 199 e.printStackTrace(); 200 } catch (JsonMappingException e) { 201 e.printStackTrace(); 202 } catch (IOException e) { 203 e.printStackTrace(); 204 } 205 } 206 207 /** 208 * <b>function:</b>json字符串转换成Array 209 * 210 */ 211 @Test 212 public void myReadJson2Array() { 213 String json = " [{\"goodsId\":\"10\",\"goodsName\":\"苹果4\"},{\"goodsId\":\"2\",\"goodsName\":\"note2\"}]"; 214 try { 215 BuyOrderDetail[] arr = objectMapper.readValue(json, BuyOrderDetail[].class); 216 System.out.println(arr.length); 217 for (int i = 0; i < arr.length; i++) { 218 System.out.println(arr[i]); 219 } 220 221 } catch (JsonParseException e) { 222 e.printStackTrace(); 223 } catch (JsonMappingException e) { 224 e.printStackTrace(); 225 } catch (IOException e) { 226 e.printStackTrace(); 227 } 228 } 229 230 }
多种格式的嵌套
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原文地址:http://www.cnblogs.com/he-123/p/5313773.html