Android开源：JSON － 简单易用的json解析
IsabelLandi
8年前
<h2>JSON</h2> <p><img src="https://simg.open-open.com/show/f5a4a4912fd35f29eb553589653a6258.jpg"></p> <p>简单易用的json解析，json生成器和基于JSONArray和JSONObject for Android的数据存储．</p> <h2>添加到项目</h2> <p>To use JSON you must add it as a dependency in your Gradle build:</p> <p>Step 1. Add the JitPack repository to your build file Add it in your root build.gradle at the end of repositories:</p> <pre> allprojects { repositories { ... maven { url "https://jitpack.io" } } }</pre> <p>Step 2. Add the dependency</p> <pre> dependencies { compile 'com.github.amirdew:JSON:v1.0.0' }</pre> <h2>使用</h2> <p>You can create JSON object from string and access data with key() and index() methods.</p> <pre> String simpleJsonString = "{\"id\":1,\"name\":\"A green door\",\"price\":12.5,\"tags\":[\"home\",\"green\"]}"; JSON json = new JSON(simpleJsonString); //access data String firstTag = json.key("tags").index(0).stringValue(); Double price = json.key("price").doubleValue();</pre> <p>products json:</p> <pre> [ { "id": 2, "name": "An ice sculpture", "price": 12.50, "tags": ["cold", "ice"], "dimensions": { "length": 7.0, "width": 12.0, "height": 9.5 }, "warehouseLocation": { "latitude": -78.75, "longitude": 20.4 } }, { "id": 3, "name": "A blue mouse", "price": 25.50, "dimensions": { "length": 3.1, "width": 1.0, "height": 1.0 }, "warehouseLocation": { "latitude": 54.4, "longitude": -32.7 } } ]</pre> <p>loop:</p> <pre> for(int i=0; i<products.count(); i++){ json productInfo = products.index(i); String productName = productInfo.key("name").stringValue(); }</pre> <p>JSON is exception and null free, you can use key() and index() many times without worry about any exception.</p> <pre> int someValue = products.index(8).key("someKey").index(1).key("someOther").intValue(); //someValue = 0</pre> <p>check index or key is exist or is null:</p> <pre> if( products.index(3).key("someKey").isNull() ){ /*...*/ } if( products.index(1).key("someKey").exist() ){ /*...*/ }</pre> <h2>方法</h2> <table> <thead> <tr> <th>Method</th> <th>Input type</th> <th>Return type</th> <th>Default</th> <th>Description</th> </tr> </thead> <tbody> <tr> <td>key()</td> <td>String</td> <td>JSON</td> <td>-</td> <td>if object is a dictionary return JSON object with input key</td> </tr> <tr> <td>index()</td> <td>int</td> <td>JSON</td> <td>-</td> <td>if object is a array return JSON object with input index</td> </tr> <tr> <td>stringValue()</td> <td>-</td> <td>String</td> <td>empty string ("")</td> <td>return .toString() of object</td> </tr> <tr> <td>intValue()</td> <td>-</td> <td>int</td> <td>0</td> <td>return integer value if possible</td> </tr> <tr> <td>longValue()</td> <td>-</td> <td>long</td> <td>0</td> <td>return long value if possible</td> </tr> <tr> <td>doubleValue()</td> <td>-</td> <td>Double</td> <td>0</td> <td>return Double value if possible</td> </tr> <tr> <td>booleanValue()</td> <td>-</td> <td>boolean</td> <td>false</td> <td>return true if object is kind of boolean and true or is kind of string and equal "true"</td> </tr> <tr> <td>value()</td> <td>-</td> <td>Object</td> <td>-</td> <td>return related object</td> </tr> <tr> <td>count()</td> <td>-</td> <td>int</td> <td>0</td> <td>if related object is a dictionary return number of keys, if related object is a array return length of array</td> </tr> <tr> <td>isNull()</td> <td>-</td> <td>boolean</td> <td>-</td> <td>return true if related object is null</td> </tr> <tr> <td>exist()</td> <td>-</td> <td>boolean</td> <td>-</td> <td>return true if related object with index or key exists</td> </tr> <tr> <td>getJsonArray()</td> <td>-</td> <td>JSONArray</td> <td>null</td> <td>return related JSONArray</td> </tr> <tr> <td>getJsonObject()</td> <td>-</td> <td>JSONObject</td> <td>null</td> <td>return related JSONObject</td> </tr> </tbody> </table> <h2>用法 - 生成json，数据保存</h2> <p>You can use JSON.dic() and JSON.array() static methods to generate json string or hold and pass data</p> <pre> JSON generatedJsonObject = JSON.create( JSON.dic( "someKey", "someValue", "someArrayKey", JSON.array( "first", 1, 2, JSON.dic( "emptyArrayKey", JSON.array() ) ) ) ); String jsonString = generatedJsonObject.toString();</pre> <p>result:</p> <pre> { "someKey": "someValue", "someArrayKey": [ "first", 1, 2, { "emptyArrayKey": [] } ] }</pre> <p>add, edit, remove:</p> <p>note: now its work for first level only</p> <pre> generatedJsonObject.addEditWithKey("someArrayKey","someOtherValue");</pre> <p>result:</p> <pre> { "someKey": "someValue", "someArrayKey": "someOtherValue" }</pre> <h2>Available methods - generate, edit, remove</h2> <table> <thead> <tr> <th>Method</th> <th>Input type</th> <th>Description</th> </tr> </thead> <tbody> <tr> <td>add()</td> <td>Object</td> <td>if current related object is an array add object at end of array</td> </tr> <tr> <td>remove()</td> <td>Object</td> <td>if current related object is an array and input object exist, remove it from array</td> </tr> <tr> <td>addWithIndex()</td> <td>Object, int</td> <td>if current related object is an array replace input object with object for input index</td> </tr> <tr> <td>addWithIndex()</td> <td>Object, int</td> <td>if current related object is an array replace input object with object for input index</td> </tr> <tr> <td>removeWithIndex()</td> <td>int</td> <td>if current related object is an array remove object for input index</td> </tr> <tr> <td>addEditWithKey()</td> <td>String, Object</td> <td>if current related object is a dictionary add input object with input key</td> </tr> <tr> <td>removeWithKey()</td> <td>String</td> <td>if current related object is a dictionary remove object with input key</td> </tr> <tr> <td>static create()</td> <td>Object</td> <td>create new instance of JSON with input object</td> </tr> <tr> <td>static dic()</td> <td>Object...</td> <td>if number of input objects is even create JSONObject use even objects as key and odd obejcts as value</td> </tr> <tr> <td>static array()</td> <td>Object...</td> <td>create JSONArray use input objects</td> </tr> </tbody> </table> <p> </p> <p> </p> <p> </p>