使用gson，java对象和json字符串之间相互转化

[{"title":"（ 12 个子文件 173KB ） 使用gson，java对象和json字符串之间相互转化","children":[{"title":"haluo","children":[{"title":".project <span style='color:#111;'> 381B </span>","children":null,"spread":false},{"title":"bin","children":[{"title":"Test.class <span style='color:#111;'> 1.52KB </span>","children":null,"spread":false},{"title":"County.class <span style='color:#111;'> 698B </span>","children":null,"spread":false},{"title":"City.class <span style='color:#111;'> 706B </span>","children":null,"spread":false},{"title":"Province.class <span style='color:#111;'> 632B </span>","children":null,"spread":false}],"spread":true},{"title":".settings","children":[{"title":"org.eclipse.jdt.core.prefs <span style='color:#111;'> 629B </span>","children":null,"spread":false}],"spread":true},{"title":"src","children":[{"title":"City.java <span style='color:#111;'> 248B </span>","children":null,"spread":false},{"title":"Test.java <span style='color:#111;'> 976B </span>","children":null,"spread":false},{"title":"County.java <span style='color:#111;'> 239B </span>","children":null,"spread":false},{"title":"Province.java <span style='color:#111;'> 188B </span>","children":null,"spread":false}],"spread":true},{"title":"jars","children":[{"title":"gson-2.2.4.jar <span style='color:#111;'> 185.96KB </span>","children":null,"spread":false}],"spread":true},{"title":".classpath <span style='color:#111;'> 359B </span>","children":null,"spread":false}],"spread":true}],"spread":true}]