使用（七牛云）为例子实现将文件上传到云服务器

目的

目前，用户的头像、分享生成的长图等文件都是存放在本地的，我们可以将他们存放在云服务器中，此处我们使用七牛云作为例子示范。

七牛云

创建账户并申请如下的两个bucket，分别是用户头像的存储空间和分享长图的存储空间。

导入依赖

		
		<dependency>
			<groupId>com.qiniugroupId>
			<artifactId>qiniu-java-sdkartifactId>
			<version>7.13.1version>
		dependency>
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配置

# qiniu
qiniu.key.accessKey=
qiniu.key.secretKey=
qiniu.bucket.header.name=coderforum-header
qiniu.bucket.header.url=
qiniu.bucket.share.name=coderforum-share
qiniu.bucket.share.url=
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Controller

@Controller
@RequestMapping("/user")
public class UserController implements CommunityConstant {

    private static Logger logger = LoggerFactory.getLogger(UserController.class);

    @Value("${qiniu.key.accessKey}")
    private String accessKey;

    @Value("${qiniu.key.secretKey}")
    private String secretKey;

    @Value("${qiniu.bucket.header.name}")
    private String headerBucketName;

    @Value("${qiniu.bucket.header.url}")
    private String headerBucketUrl;

    @LoginRequired
    @RequestMapping(path = "/setting", method = RequestMethod.GET)
    public String getSettingPage(Model model) {
        // set the name of the uploaded file
        String fileName = CommunityUtil.generateUUID();

        // set the information of the response
        StringMap policy = new StringMap();
        policy.put("returnBody", CommunityUtil.getJSONString(0));

        // generate the certificate of uploading
        Auth auth = Auth.create(accessKey, secretKey);
        String uploadToken = auth.uploadToken(headerBucketName, fileName, 3600, policy);

        model.addAttribute("uploadToken", uploadToken);
        model.addAttribute("fileName", fileName);

        return "/site/setting";
    }

    // update the path of profile picture
    @PostMapping(path = "/header/url")
    @ResponseBody
    public String updateHeaderUrl(String fileName){
        if(StringUtils.isBlank(fileName)){
            return CommunityUtil.getJSONString(1, "The file name cane is required.");
        }

        String url = headerBucketUrl + "/" + fileName;
        userService.updateHeader(hostHolder.getUser().getId(), url);

        return CommunityUtil.getJSONString(0);
    }
}
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前端

				<form class="mt-5" id="uploadForm">
					<div class="form-group row mt-4">
						<label for="head-image" class="col-sm-2 col-form-label text-right">choose a photo:label>
						<div class="col-sm-10">
							<div class="custom-file">
								<input type="hidden" name="token" th:value="${uploadToken}">
								<input type="hidden" name="key" th:value="${fileName}">
								<input type="file" class="custom-file-input" id="head-image" name="file" lang="es" required="">
								<label class="custom-file-label" for="head-image" data-browse="文件">select a photolabel>
								<div class="invalid-feedback">
									This account does not exist!
								div>
							div>
						div>
					div>
					<div class="form-group row mt-4">
						<div class="col-sm-2">div>
						<div class="col-sm-10 text-center">
							<button type="submit" class="btn btn-info text-white form-control">uploadbutton>
						div>
					div>
				form>


	<script th:src="@{/js/setting.js}">script>
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相应的js文件：

$(function(){
    $("#uploadForm").submit(upload);
});

function upload() {
    $.ajax({
        url: "https://upload-z1.qiniup.com",
        method: "post",
        processData: false,
        contentType: false,
        data: new FormData($("#uploadForm")[0]),
        success: function(data) {
            if(data && data.code == 0) {
                // 更新头像访问路径
                $.post(
                    CONTEXT_PATH + "/user/header/url",
                    {"fileName":$("input[name='key']").val()},
                    function(data) {
                        data = $.parseJSON(data);
                        if(data.code == 0) {
                            window.location.reload();
                        } else {
                            alert(data.msg);
                        }
                    }
                );
            } else {
                alert("Upload failed!");
            }
        }
    });
    return false;
}
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查看

文件已经存入七牛云