网络聊天室带有文件上传下载功能

[{"title":"（ 48 个子文件 1.75MB ） 网络聊天室带有文件上传下载功能","children":[{"title":"ChatRoom项目报告.docx <span style='color:#111;'> 14.77KB </span>","children":null,"spread":false},{"title":"chatRoomClient.jar <span style='color:#111;'> 76.98KB </span>","children":null,"spread":false},{"title":"chatroom","children":[{"title":".project <span style='color:#111;'> 384B </span>","children":null,"spread":false},{"title":"bin","children":[{"title":"chatmodel","children":[{"title":"User.class <span style='color:#111;'> 767B </span>","children":null,"spread":false},{"title":"FileModel.class <span style='color:#111;'> 922B </span>","children":null,"spread":false}],"spread":true},{"title":"chatclient","children":[{"title":"ServerFileThread$ClientFileThread.class <span style='color:#111;'> 3.52KB </span>","children":null,"spread":false},{"title":"Client$2.class <span style='color:#111;'> 656B </span>","children":null,"spread":false},{"title":"MessageThread.class <span style='color:#111;'> 5.18KB 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