=Start=<\/p>\n\n\n\n
\u56e0\u4e3a\u963f\u91cc\u5f00\u6e90\u7684fastjson\u524d\u6bb5\u65f6\u95f4\u7206\u51fa\u7684\u6f0f\u6d1e\u5b9e\u5728\u662f\u592a\u591a\u4e86\uff08\u800c\u4e14\u6709\u4e9b\u6f0f\u6d1e\u4ed6\u4eec\u8fd8\u559c\u6b22\u5077\u5077\u5904\u7406\uff0c\u4e0d\u53ca\u65f6\u901a\u77e5\u5e7f\u5927\u7528\u6237\u3002\u3002\u3002\uff09\uff0c\u867d\u7136\u5b83\u7528\u8d77\u6765\u5f88\u65b9\u4fbf\uff0c\u4f46\u662f\uff0c\u5b89\u5168\u7b2c\u4e00\uff0c\u65e9\u6362gson\u4fdd\u5e73\u5b89\u3002<\/p>\n\n\n\n
Gson<\/a> \u63d0\u4f9b\u7b80\u6d01\u7684 \u4e00\u4e9b\u5e38\u7528\u7684Demo\u5c55\u793a\uff0c\u65b9\u4fbf\u4ee5\u540e\u4f7f\u7528\uff1a<\/p>\n\n\n\n =END=<\/p>\n","protected":false},"excerpt":{"rendered":" =Start= \u7f18\u7531\uff1a \u56e0\u4e3a\u963f\u91cc\u5f00\u6e90\u7684fastjson\u524d\u6bb5\u65f6\u95f4\u7206\u51fa\u7684\u6f0f\u6d1e\u5b9e\u5728\u662f\u592a\u591a\u4e86\uff08\u800c\u4e14\u6709\u4e9b\u6f0f\u6d1e\u4ed6\u4eec\u8fd8\u559c\u6b22\u5077 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[23,7],"tags":[1500,1499,61,181],"class_list":["post-4621","post","type-post","status-publish","format-standard","hentry","category-knowledgebase-2","category-programing","tag-fastjson","tag-gson","tag-java","tag-json"],"views":10112,"_links":{"self":[{"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/posts\/4621","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/comments?post=4621"}],"version-history":[{"count":1,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/posts\/4621\/revisions"}],"predecessor-version":[{"id":4622,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/posts\/4621\/revisions\/4622"}],"wp:attachment":[{"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/media?parent=4621"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/categories?post=4621"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/tags?post=4621"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}toJson()<\/code> \u548c fromJson()<\/code> \u65b9\u6cd5\u4ee5\u5728Java\u5bf9\u8c61\u548cjson\u5b57\u7b26\u4e32\u4e4b\u95f4\u8fdb\u884c\u8f6c\u6362\uff1a<\/p>\n\n\n\ntoJson()<\/code> \u2013 Java object to JSON<\/li>fromJson()<\/code> \u2013 JSON to Java object<\/li><\/ul>\n\n\n\n
\n\n\n\npackage com.ixyzero.learn.utils;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.reflect.TypeToken;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.List;
import java.util.Map;
\/**
* Created by ixyzero on 2019\/9\/13.
*\/
public class LearnGson {
public static void main(String[] args) {
\/\/ Gson gson = new Gson();
\/\/ pretty print
Gson gson = new GsonBuilder().setPrettyPrinting().create();
\/\/ \u5c06 JSON \u5b57\u7b26\u4e32\u8f6c\u6362\u6210 Map \u5bf9\u8c61
String json = \"{\\\"name\\\":\\\"ixyzero.com\\\", \\\"age\\\":11}\";
Map<String, Object> map = gson.fromJson(json, new TypeToken<Map<String, Object>>() {}.getType());
\/\/ JDK 1.8 \u652f\u6301\u7684 Lambda \u8868\u8fbe\u5f0f
map.forEach((x, y) -> System.out.println(\"key : \" + x + \" , value : \" + y));
\/\/ \u5e38\u89c4 for \u5faa\u73af\u6253\u5370 Map
for (String key : map.keySet()) {
System.out.println(\"Key: \" + key + \", Value: \" + map.get(key));
}
System.out.println();
\/\/ \u5c06 JSON \u6587\u4ef6\u8f6c\u6362\u6210 Map \u5bf9\u8c61
try {
map = gson.fromJson(new FileReader(\"\/path\/to\/input.json\"), new TypeToken<Map<String, Object>>() {}.getType());
} catch (FileNotFoundException e) {
e.printStackTrace();
}
\/\/ JDK 1.8 \u652f\u6301\u7684 Lambda \u8868\u8fbe\u5f0f
map.forEach((x, y) -> System.out.println(\"key : \" + x + \" , value : \" + y));
System.out.println();
\/\/ \u5c06 JSON \u6570\u7ec4\u8f6c\u6362\u6210 List \u5bf9\u8c61
json = \"[{\\\"name\\\":\\\"ixyzero.com\\\"}, {\\\"name\\\":\\\"test\\\"}]\";
List<Map<String, String>> list = gson.fromJson(json, new TypeToken<List<Map<String, String>>>() {}.getType());
list.forEach(x -> System.out.println(x));
System.out.println();
for (int i = 0; i < list.size(); i++) {
System.out.println( list.get(i) );
list.get(i).forEach((x, y) -> System.out.println(\"key : \" + x + \" , value : \" + y));
System.out.println();
}
\/\/ \u5c06 Java \u5bf9\u8c61\u5b58\u5165\u6587\u4ef6\uff08\u501f\u52a9 GsonBuilder().setPrettyPrinting().create() \u8fdb\u884c\u683c\u5f0f\u5316\uff09
try (FileWriter writer = new FileWriter(\"\/path\/to\/output.json\")) {
gson.toJson(map, writer);
} catch (IOException e) {
e.printStackTrace();
}
System.out.println();
\/\/ \u5c06 Java \u5bf9\u8c61\u8f6c\u6362\u6210 json \u5b57\u7b26\u4e32
String output = gson.toJson(map);
System.out.println(output);
}
}
\/**
* content of 'input.json' *
{
\"name\": \"11-27-gson-deserialization\",
\"version\": \"1.0.0\",
\"description\": \"\",
\"main\": \"index.js\",
\"scripts\": {
\"prestart\": \"javac -classpath lib\/gson-2.8.0.jar TestMain.java\",
\"start\": \"java -classpath .:lib\/gson-2.8.0.jar TestMain\"
},
\"license\": \"MIT\"
}
*\/<\/pre>\n\n\n\n\u53c2\u8003\u94fe\u63a5\uff1a<\/h5>\n\n\n\n
https:\/\/www.mkyong.com\/java\/how-to-parse-json-with-gson\/<\/a><\/li>