差異處
這裏顯示兩個版本的差異處。
| 下次修改 | 前次修改 | ||
|
java:jackson:helloworld [2016/02/16 23:11] tony 建立 |
java:jackson:helloworld [2023/06/25 09:48] (目前版本) |
||
|---|---|---|---|
| 行 41: | 行 41: | ||
| } | } | ||
| } | } | ||
| + | </code> | ||
| + | 這裡必須特別注意的是，Jackson會優先使用get method為欄位名稱。下面這個範例所輸出的ss值為test而不是test2，即使對ss加上@JsonProperty(value="ss")也是test: | ||
| + | <code java> | ||
| + | public String ss = "test2"; | ||
| + | |||
| + | public String getSS(){ | ||
| + | return "test"; | ||
| + | } | ||
| + | </code> | ||
| + | 一般的member宣告會使用m開頭，如果@JsonProperty的value和get method不同，就會導致同時輸出method欄位與@JsonProperty宣告的欄位: | ||
| + | <code java> | ||
| + | @JsonProperty(value="s1") | ||
| + | private String mss = "test2"; | ||
| + | |||
| + | public String getSS(){ | ||
| + | return "test"; | ||
| + | } | ||
| + | </code> | ||
| + | Output: | ||
| + | <code> | ||
| + | "ss":"test","s1":"test2" | ||
| </code> | </code> | ||
| ===== Convert to json ===== | ===== Convert to json ===== | ||
| 行 48: | 行 69: | ||
| ObjectMapper mapper = new ObjectMapper(); | ObjectMapper mapper = new ObjectMapper(); | ||
| - | JsonGenerator generator = null; | + | JsonGenerator generator = mapper.getFactory().createGenerator(System.out); |
| - | try { | + | |
| - | generator = mapper.getFactory().createGenerator(System.out); | + | |
| - | User u = new User(); | + | User u = new User(); |
| - | u.setID("user"); | + | u.setID("user"); |
| - | u.setPasswd("123456"); | + | u.setPasswd("123456"); |
| - | generator.writeObject(u); | + | generator.writeObject(u); |
| - | } finally { | + | |
| - | closeStream(generator); | + | |
| - | } | + | |
| - | } | + | |
| - | + | ||
| - | private void closeStream(Closeable aCloseable){ | + | |
| - | if (aCloseable != null) | + | |
| - | try { | + | |
| - | aCloseable.close(); | + | |
| - | } catch (IOException e) { | + | |
| - | } | + | |
| } | } | ||
| </code> | </code> | ||
| 行 79: | 行 87: | ||
| public void testXmlGenerator() throws IOException { | public void testXmlGenerator() throws IOException { | ||
| XmlMapper mapper = new XmlMapper(); | XmlMapper mapper = new XmlMapper(); | ||
| - | JsonGenerator generator = null; | + | JsonGenerator generator = mapper.getFactory().createGenerator(System.out); |
| - | try { | + | |
| - | generator = mapper.getFactory().createGenerator(System.out); | + | |
| - | User u = new User(); | + | User u = new User(); |
| - | u.setID("user"); | + | u.setID("user"); |
| - | u.setPasswd("123456"); | + | u.setPasswd("123456"); |
| - | generator.writeObject(u); | + | generator.writeObject(u); |
| - | } finally { | + | |
| - | closeStream(generator); | + | |
| - | } | + | |
| } | } | ||
| </code> | </code> | ||
