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docs/zh/docs/tutorial/request-forms-and-files.md

# 请求表单与文件

FastAPI 支持同时使用 `File` 和 `Form` 定义文件和表单字段。

!!! info "说明"

    接收上传文件或表单数据，要预先安装 <a href="https://github.com/Kludex/python-multipart" class="external-link" target="_blank">`python-multipart`</a>。

    例如，`pip install python-multipart`。

## 导入 `File` 与 `Form`

```Python hl_lines="1"
{!../../../docs_src/request_forms_and_files/tutorial001.py!}
```

## 定义 `File` 与 `Form` 参数

创建文件和表单参数的方式与 `Body` 和 `Query` 一样：

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github.com/golang/go

src/mime/multipart/formdata.go

// memory.
func (r *Reader) ReadForm(maxMemory int64) (*Form, error) {
	return r.readForm(maxMemory)
}

var (
	multipartfiles    = godebug.New("#multipartfiles") // TODO: document and remove #
	multipartmaxparts = godebug.New("multipartmaxparts")
)

func (r *Reader) readForm(maxMemory int64) (_ *Form, err error) {
	form := &Form{make(map[string][]string), make(map[string][]*FileHeader)}
	var (

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github.com/codelibs/fess

src/main/java/org/codelibs/fess/app/web/admin/fileconfig/CreateForm.java

    @CustomSize(maxKey = "form.admin.max.input.size")
    public String paths;

    @CustomSize(maxKey = "form.admin.max.input.size")
    public String includedPaths;

    @CustomSize(maxKey = "form.admin.max.input.size")
    public String excludedPaths;

    @CustomSize(maxKey = "form.admin.max.input.size")
    public String includedDocPaths;

    @CustomSize(maxKey = "form.admin.max.input.size")

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github.com/codelibs/fess

src/main/webapp/WEB-INF/view/admin/maintenance/admin_maintenance.jsp

                            <div class="card-body">
                                <div class="form-group row">
                                    <span class="font-weight-bold col-sm-3 text-sm-right col-form-label"><la:message
                                            key="labels.replace_aliases"/></span>
                                    <div class="form-inline col-sm-9">
                                        <la:errors property="replaceAliases"/>

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github.com/codelibs/fess

src/main/webapp/WEB-INF/view/admin/relatedcontent/admin_relatedcontent_edit.jsp

                                        <la:text styleId="term" property="term" styleClass="form-control"/>
                                    </div>
                                </div>
                                <div class="form-group row">
                                    <label for="content" class="col-sm-3 text-sm-right col-form-label"><la:message
                                            key="labels.related_content_content"/></label>

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github.com/codelibs/fess

src/main/java/org/codelibs/fess/app/web/admin/plugin/AdminPluginAction.java

    }

    @Execute
    @Secured({ ROLE })
    public HtmlResponse delete(final DeleteForm form) {
        validate(form, messages -> {}, () -> asHtml(path_AdminPlugin_AdminPluginJsp));
        verifyToken(() -> asHtml(path_AdminPlugin_AdminPluginJsp));
        final Artifact artifact = new Artifact(form.name, form.version, null);
        deleteArtifact(artifact);

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github.com/codelibs/fess

src/main/java/org/codelibs/fess/app/web/admin/storage/AdminStorageAction.java

    public HtmlResponse editTags(final TagForm form) {
        validate(form, messages -> {}, () -> asEditTagsHtml(form.path, form.name));
        saveToken();
        return asEditTagsHtml(form.path, form.name);
    }

    @Execute
    @Secured({ ROLE })
    public HtmlResponse updateTags(final TagForm form) {
        validate(form, messages -> {}, () -> asEditTagsHtml(form.path, form.name));

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github.com/tiangolo/fastapi

docs/de/docs/tutorial/request-forms-and-files.md

    Sie können mehrere `File`- und `Form`-Parameter in einer *Pfadoperation* deklarieren, aber Sie können nicht gleichzeitig auch `Body`-Felder deklarieren, welche Sie als JSON erwarten, da der Request den Body mittels `multipart/form-data` statt `application/json` kodiert.

    Das ist keine Limitation von **FastAPI**, sondern Teil des HTTP-Protokolls.

## Zusammenfassung

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github.com/golang/go

src/mime/multipart/formdata_test.go

	fr.tempDir = t.TempDir()
	form, err := fr.ReadForm(0)
	if err != nil {
		t.Fatal(err)
	}
	for i := 0; i < numFiles; i++ {
		name := fmt.Sprint(i)
		if got := len(form.File[name]); got != 1 {
			t.Fatalf("form.File[%q] has %v entries, want 1", name, got)
		}
		fh := form.File[name][0]
		file, err := fh.Open()
		if err != nil {
			t.Fatalf("form.File[%q].Open() = %v", name, err)
		}

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github.com/tiangolo/fastapi

docs_src/request_files/tutorial002.py


@app.get("/")
async def main():
    content = """
<body>
<form action="/files/" enctype="multipart/form-data" method="post">
<input name="files" type="file" multiple>
<input type="submit">
</form>
<form action="/uploadfiles/" enctype="multipart/form-data" method="post">
<input name="files" type="file" multiple>
<input type="submit">
</form>
</body>
    """

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