Springboot Batch结果输出怎么弄

在Spring Boot Batch应用中，将处理结果输出到不同的渠道（例如：控制台、文件、数据库等）可以通过配置StepExecutionListener和ItemWriter来实现。以下是一个简单的示例，演示如何将结果输出到控制台和文件。

首先，创建一个实现ItemWriter接口的类，用于将处理结果写入到文件中：

import org.springframework.batch.item.ItemWriter;
import org.springframework.stereotype.Component;

import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;

@Component
public class FileItemWriter implements ItemWriter<String> {

    private String filePath;

    public FileItemWriter(String filePath) {
        this.filePath = filePath;
    }

    @Override
    public void write(List<? extends String> items) throws IOException {
        try (BufferedWriter writer = new BufferedWriter(new FileWriter(filePath, true))) {
            for (String item : items) {
                writer.write(item);
                writer.newLine();
            }
        }
    }
}

创建一个实现StepExecutionListener接口的类，用于在步骤执行前后执行操作，并输出处理结果到控制台：

import org.springframework.batch.core.ExitStatus;
import org.springframework.batch.core.StepExecution;
import org.springframework.batch.core.StepExecutionListener;
import org.springframework.stereotype.Component;

@Component
public class ConsoleStepExecutionListener implements StepExecutionListener {

    @Override
    public ExitStatus afterStep(StepExecution stepExecution) {
        System.out.println("处理结果: " + stepExecution.getJobExecution().getJobParameters().getString("result"));
        return null;
    }

    @Override
    public void beforeStep(StepExecution stepExecution) {
    }
}

在你的JobConfiguration类中，配置Step，并将上面创建的FileItemWriter和ConsoleStepExecutionListener添加到Step中：

import org.springframework.batch.core.Job;
import org.springframework.batch.core.Step;
import org.springframework.batch.core.configuration.annotation.JobBuilderFactory;
import org.springframework.batch.core.configuration.annotation.StepBuilderFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import java.util.Arrays;

@Configuration
public class JobConfiguration {

    @Autowired
    public JobBuilderFactory jobBuilderFactory;

    @Autowired
    public StepBuilderFactory stepBuilderFactory;

    @Bean
    public Job job() {
        return jobBuilderFactory.get("job")
                .incrementer(new RunIdIncrementer())
                .start(step())
                .build();
    }

    @Bean
    public Step step() {
        return stepBuilderFactory.get("step")
                .<String, String>chunk(1)
                .reader(reader())
                .writer(fileItemWriter())
                .listener(consoleStepExecutionListener())
                .build();
    }

    // 配置你的Reader和其他组件
}

现在，当你运行你的Spring Boot Batch应用时，处理结果将被同时输出到控制台和指定的文件中。

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