一些简单的JSON格式解析可以直接使用JSONObject和JSONArray来解析，但是面对比较复杂或者是数据量较大的JSON数据时就需要使用fastJSON和Gson来解析了，这样的效率和效果都更好。
这里介绍本次项目使用到的Gson解析，fastJSON类似，但是由于如果包含了fastJSON,那么在proguard混淆的时候需要在rule中包含以下内容：
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| -keepattributes Signature // 避免混淆泛型
-keepattributes *Annotation* // 不混淆注解
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如果不包含的话，就会出现以下几个问题：
１. 加了符号Annotation的实体属性后，一使用就崩溃
２. 当有泛型属性时，一使用就崩溃
接下来就先总结一下Gson的解析
GSON 简单解析
先是解析JSONObject
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| Gson gson = new Gson();
Person person = gson.fromJson(response, Person.class);
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再是解析JSONArray
需要借助TypeToken将期望解析成的数据类型传入fromJson方法
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| Gson gson = new Gson();
List<Person> datas = gson.fromJson(response, new TypeToken<List<Person>>(){}.getType());
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GSON 复杂解析
JSON返回的数据如下：
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| {"code":0,"desc":"Success","content":{"grade":14,"signin":false,"room":"","docs":[{"id":331,"docname":"[SFTM财务系统改善]成本支付-2.xlsxsdfsdfsdfsdfsdfsdfsdfsdfsdfsdfsd.xlsx","pagecnt":8,"doctime":"2015-11-28"},{"id":332,"docname":"外勤1.0需求细分列表修改版.docx","pagecnt":4,"doctime":"2015-11-28"},{"id":333,"docname":"1.docx","pagecnt":1,"doctime":"2015-11-29"},{"id":334,"docname":"要件签字封面（部品单价）.xls","pagecnt":3,"doctime":"2015-11-29"}],"printer":[{"id":1,"address":"5104"}]}}
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上面的JSON数据总结一下，也就包含以下几个内容：
首先第一层是code, desc,content
第二层content中包含以下的内容：grade, signin, room, docs，printer
第三层docs中包含以下内容: id, docname, pagecnt, doctime
第三层printer中包含以下内容:id, address
对于这种比较复杂的JSON数据格式的解析，可以分成以下几步来做：
- 创建一个实体
- 在实体中包含３个属性
- 创建一个静态内部类，该类中包含的属性就是content中存在的内容，也就是grade, signin, room, docs，printer。如果content是一个[]，就应该定义为List,如果是{},就定义为DocContent
- 再在content创建的静态内部类中创建两个静态内部类：Docs和Printer
总体的效果如下：
第一层
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| private int code;
private String desc;
private DocContent content;
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第二层
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| public static class DocContent {
private int grade;
private Boolean signin;
private String room;
private List<Docs> docs;
private List<Printer> printer;
}
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第三层
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| public static class Docs {
private String docname;
private int pagecnt;
private String doctime;
}
public static class Printer {
private int id;
private String address;
}
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当然咯，其中还要包括各种setter和getter方法，只需要注意一点，这里的属性被声明为List是因为这个是一个JSONArray，对于JSONObject只需要直接定义
完整代码如下：
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| public class JsonDatas_DocInfo {
public int getCode() {
return code;
}
public void setCode(int code) {
this.code = code;
}
public String getDesc() {
return desc;
}
public void setDesc(String desc) {
this.desc = desc;
}
public DocContent getContent() {
return content;
}
public void setContent(DocContent content) {
this.content = content;
}
private int code;
private String desc;
private DocContent content;
public static class DocContent {
public int getGrade() {
return grade;
}
public void setGrade(int grade) {
this.grade = grade;
}
public Boolean getSignin() {
return signin;
}
public void setSignin(Boolean signin) {
this.signin = signin;
}
public String getRoom() {
return room;
}
public void setRoom(String room) {
this.room = room;
}
public List<Docs> getDocs() {
return docs;
}
public void setDocs(List<Docs> docs) {
this.docs = docs;
}
public List<Printer> getPrinter() {
return printer;
}
public void setPrinter(List<Printer> printer) {
this.printer = printer;
}
private int grade;
private Boolean signin;
private String room;
private List<Docs> docs;
private List<Printer> printer;
public static class Docs {
private int id;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getDocname() {
return docname;
}
public void setDocname(String docname) {
this.docname = docname;
}
public int getPagecnt() {
return pagecnt;
}
public void setPagecnt(int pagecnt) {
this.pagecnt = pagecnt;
}
public String getDoctime() {
return doctime;
}
public void setDoctime(String doctime) {
this.doctime = doctime;
}
private String docname;
private int pagecnt;
private String doctime;
}
public static class Printer {
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
private int id;
private String address;
}
}
}
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调用的方法：
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| Gson gson = new Gson();
JsonDatas_DocInfo jsonDatas_docInfo = gson.fromJson(response, JsonDatas_DocInfo.class);
List<JsonDatas_DocInfo.DocContent.Docs> docs = jsonDatas_docInfo.getContent().getDocs();
if (docs != null) {
for (JsonDatas_DocInfo.DocContent.Docs tempDoc : docs) {
final int id = tempDoc.getId();
final String docname = tempDoc.getDocname();
final int pagecnt = tempDoc.getPagecnt();
final String doctime = tempDoc.getDoctime();
Log.d("info", id + ", docname:" + docname + ", pagecnt : " +
pagecnt + ", doctime : " + doctime);
listDocInfo.add(new DocInfo(id, docname, pagecnt, doctime));
}
handler.sendMessage(msg);
}
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