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# 生成增强型文档
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`[EnhancedDocument](https://sdk.amazonaws.com/java/api/latest/software/amazon/awssdk/enhanced/dynamodb/document/EnhancedDocument.html)` 表示具有复杂结构和嵌套属性的文档类型对象。`EnhancedDocument` 需要与为 `DocumentTableSchema` 指定的主键属性相匹配的顶级属性。其余内容是任意的，可以由顶级属性以及深度嵌套的属性组成。

您可以使用提供多种元素添加方法的生成器来创建 `EnhancedDocument` 实例。

## 使用 JSON 字符串生成
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使用 JSON 字符串，您可以在一个方法调用中生成 `EnhancedDocument`。以下代码段从 `jsonPerson()` 帮助程序方法返回的 JSON 字符串创建一个 `EnhancedDocument`。`jsonPerson()` 方法返回前面显示的 [person 对象](ddb-en-client-doc-api-steps.md#ddb-en-client-doc-api-steps-createschema-obj)的 JSON 字符串版本。

```
EnhancedDocument document = 
        EnhancedDocument.builder()
                        .json( jsonPerson() )
                        .build());
```

## 基于单个元素构建
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或者，您可以使用生成器的类型安全方法从各个组件生成 `EnhancedDocument` 实例。

以下示例生成一个 `person` 增强型文档，该文档类似于上一个示例中从 JSON 字符串生成的增强型文档。

```
        /* Define the shape of an address map whose JSON representation looks like the following.
           Use 'addressMapEnhancedType' in the following EnhancedDocument.builder() to simplify the code.
           "home": {
             "zipCode": "00000",
             "city": "Any Town",
             "state": "FL",
             "street": "123 Any Street"
           }*/
        EnhancedType<Map<String, String>> addressMapEnhancedType =
                EnhancedType.mapOf(EnhancedType.of(String.class), EnhancedType.of(String.class));


        //  Use the builder's typesafe methods to add elements to the enhanced document.
        EnhancedDocument personDocument = EnhancedDocument.builder()
                .putNumber("id", 50)
                .putString("firstName", "Shirley")
                .putString("lastName", "Rodriguez")
                .putNumber("age", 53)
                .putNull("nullAttribute")
                .putJson("phoneNumbers", phoneNumbersJSONString())
                /* Add the map of addresses whose JSON representation looks like the following.
                        {
                          "home": {
                            "zipCode": "00000",
                            "city": "Any Town",
                            "state": "FL",
                            "street": "123 Any Street"
                          }
                        } */
                .putMap("addresses", getAddresses(), EnhancedType.of(String.class), addressMapEnhancedType)
                .putList("hobbies", List.of("Theater", "Golf"), EnhancedType.of(String.class))
                .build();
```

### 帮助程序方法
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```
    private static String phoneNumbersJSONString() {
        return "  [" +
                "    {" +
                "      \"type\": \"Home\"," +
                "      \"number\": \"555-0140\"" +
                "    }," +
                "    {" +
                "      \"type\": \"Work\"," +
                "      \"number\": \"555-0155\"" +
                "    }" +
                "  ]";
    }

    private static Map<String, Map<String, String>> getAddresses() {
        return Map.of(
                "home", Map.of(
                        "zipCode", "00002",
                        "city", "Any Town",
                        "state", "ME",
                        "street", "123 Any Street"));

    }
```